Without appropriate testing, it’s hard to distinguish—just by driving—among certain ignition or knock sensor faults and MAF sensor malfunctions. When light turned green and I accelerated there was a noticeable stutter or hesitation by the engine. put it on testbook, showed a faulty left hand oxygen sensor and that was it, no MAF sensor issues or any other codes, so we ordered a new oxygen sensor. A mass airflow sensor (MAS) determines the mass of air entering a vehicle's fuel injection engine, and passes that data to the Engine Control Unit, or ECU. If OK, REPLACE the TP sensor. In this project you can see how to control servo motor and tu calculate distance using arduino and ultrasonic sensor. Focus on the calculated MAF output, many times expressed in grams per. One of the more frequent problems with modern vehicles is a bad throttle position sensor (TPS). Ford Mondeo III (2000 - 2007) - 03 2. Starting at 60K miles, I have been cleaning the MAF every 30K miles using CRC Mass Air Flow Sensor Cleaner (spraying only, never touching the wires). It is nearly impossible to determine if a MAF sensor's thermistor is dirty or clean from looking at it without magnification and good lighting. Can I get a good tune on the MAF without it? MAF Tuning without wideband? Results 1 to 7 of 7 This will get your driving cells OK, because the car is going to. Brands offer different variants when it comes to design and packaging. 128 you will want to make the MAF frequency number lower. 5 volts between terminals A and B of the MAF sensor connector. From battery sensors to fuel cutoff sensors, we have everything you need to maintain your electrical and lighting accessories - and more. Without these 10 to 12 volts, your Toyota's MAF sensor won't work. It's not all the time that you find yourself in need of a replacement Mass Air Flow MAF Sensor for your car or truck. If left unaddressed for an extended period of time, it can cause headaches. 01 to replace it. MAF, TPS, or O2 Sensor - So i bought a 2002 volvo s60 2. The one you did and the current one has the same two entries for MAF. If the MAF meter, air lid, air intake, or air filter has been modified than the MAF Airflow vs. This sensor is linked to the vehicle's computer system, and in the event that there's a leak in the EVAP, or perhaps a problem with the sensor, you will see a "check engine" signal. Came to know about MAF sensor cleaning from another forum and decided to give it a try. Check engine light faults relating to the Mass Air Flow Sensor are becoming less common, but do occur. I suspect that my MAF sensor has been faulty since I bought my disco. Fine-tuning requires having valid data from the sensors, including your knock sensor(s), O2 sensors, and MAF sensor; and it requires that you do not have any intake or exhaust leaks, which will invalidate the fuel trim readings. Some mass air flow sensors literally integrate the IAT and BARO into one single part, while others just use the IAT and BARO information to calculate the mass keeping each sensor independent. The best way to locate the IAT sensor in your vehicle if to refer to the service manual that is provided by your manufacturer. How do I know if it's the MAF letting in too much air or the O2 sensor reading wrong down stream? Not hearing any pinging. This AFR has been proven to produce the best balance of performance and emissions in gasoline applications for normal driving and idling conditions. In TEST 1, you confirmed that your Toyota's MAF sensor is getting power. Not only is a failed sensor irritating, it can also be dangerous. Yet if the light comes on and your car is not smoking or making a unusual noise, why not take a minute to check the gas cap?. It is installed between the air filter and the intake manifold of the engine. Driving without an air flow meter also known as a maf sensor for a long period of time will almost certainly damage the cat on the exhaust system. Once we disconnected it, everything started to work fine again. My Mass Air Flow sensor and the car was stalling all the time. The MAF sensor has 2 sensing elements contained within a film. Check engine light faults relating to the Mass Air Flow Sensor are becoming less common, but do occur. The MAF sensor works on the hot film principal. Page 38 Engine Management System Overview - Audi RS4 (Boxch MED 9. Now, in case you wondering if this test applies to your specific vehicle, this article covers the MAF sensor on 1996 thru' 2005 3. Is it ok to drive with it disconnected for the period of time it takes to get a replacement (days/couple of weeks) or will it cause problems?. The ECU will Use default values and use RPM and other things to compensate. I turned off the check engine light and drove for about 80 miles, the light did not come on, but next day i started driving and the check engine came on again after about 7-8 miles. As mentioned earlier, some MAF sensor ranges may be exceeded by engines that make large amounts of power. It will not run very good, but the worst simptoms should dissapear. This hot wire is maintained at 200ºC (392ºF) above ambient temperature as measured by a constant cold wire (Figure 35). Code showed running rich. Incoming search terms: Can Car Work Without O2 Sensors,Can You Drive Without O2 Sensors,Can You Run Without O2 Sensors,Can A Car Drive With The O2 Sensor Missing,Can I Drive My Chevy K1500 With The Oxygen Sensor Unhooked,Can I Drive Without O2 Sensors,Can I Run My 4 6 Wirhout O2 Sensor,Can You Drice With O2 Sensor Out,Can You Drive A Car Short. Through daily driving, these sensitive MAF sensors get layered with dirt and oil. The MAP sensor’s job is to determine the load being placed on the engine and deliver fuel to the engine accordingly. Let's see how it works. Spray 10 to 15 spurts of the (MAF) mass air flow sensor cleaner onto the wire or plate. If there's no leak, the sensor needs to be replaced. Located after the air. Just be alert for these common symptoms: 1. Put simply a MAF Sensor is designed. But considering that driving very long with a bad MAF will shorten the life of your O2 sensors and CATs (all of which can be rather expensive, many times the cost of buying the MAF even at the stealer) it seems to me rather foolish to take the chance of driving with the MAF disconnected. So the article below will explain about the MAP sensor function, working principle and the symptoms you can look out for if it were to go bad. Was driving and car shut off without warning. Driving without an air flow meter also known as a maf sensor for a long period of time will almost certainly damage the cat on the exhaust system. So I put the new MAF in and the car does the same thingStalls out !. Driving a car with the code P0171 can cause more damage to the engine over time, as when the engine runs lean, the combustion temperature is higher. put it on testbook, showed a faulty left hand oxygen sensor and that was it, no MAF sensor issues or any other codes, so we ordered a new oxygen sensor. The code that came up is P1102. Q: My dashboard Check Engine light came on and a scan tool said Code P0171 was stored on my car's computer. Also watch the video on how to clean MAF sensors without damaging the delicate part at the bottom. The air flow meter helps the engine computer make necessary adjustments. Also Mike was selling MAF cleaners at one point. False sensor outputs without an actual condition would cause stumbling and hesitation type problems, the engine wouldn't just accelerate smoothly because of a bad sensor without actually having air to speed up with. Sometimes you can unplug the MAF sensor when the engine is running, doing this should just about stop the engine from running. MAF Sensor. I have been trouble shooting these two coeds for weeks on my own. Page 38 Engine Management System Overview - Audi RS4 (Boxch MED 9. Page 1 of 2 - MAF & MAP Sensor Cleaning & IMRC Valve Cleaning - posted in 7th Gen DIY: Please remember to wear gloves when handling the cleaner solutions mentioned belowMAF SENSORThe MAF Sensor is located herePersonally I removed the air-box, but you do not need to, to remove the MAF Sensor. 3 Most Common Bad MAF Sensor Symptoms. DPFE Sensor and EGR Information. 8L V6 equipped cars. The mass air flow sensor senses the total amount of air passing the sensor and allows the fuel injection system to adjust the fuel mixture to compensate for cold weather and/or high altitude conditions. TUNING – SPEED DENSITY vs MAF BD Turnkey Engines will be SHIPPED with a Speed-Density / CLOSED Loop tune This topic is VERY debatable. While there are alcohol-based cleaners available, you can save some money by cleaning the MAF sensor with isopropyl alcohol at home. What happens if you start a car without the mass air flow sensor connected Tell If You Really Need a Mass Air Flow Sensor | Auto What happens if I run my engine without air. Likewise, the 85-89 setups do not use a MAP sensor. Loss of power and sputtering. 1V (High Oxygen, Lean mixture) to 0. Cleaning/Replacing MAF Sensor. One of these lights reads 'check engine. Absolute Throttle Position-- The absolute throttle position (not the relative or learned) throttle position. Air passing over the hot wire causes it to cool. Power to the MAF sensor is provided through a pair of relays (one for power, one for the burn-off cleaning cycle), so check the relays first if the MAF sensor appears to be dead or sluggish. The MAF sensor works on the hot film principal. Make sure it is the correct one for your car, which is e-gas. You need to have a wideband O2 sensor and the ability to data log it's signal along with the TPS voltage and MAF voltage. That was a good write up in cleaning in the Mass Air Flow Sensor of a car. Focus on the calculated MAF output, many times expressed in grams per. A MAF car has a Mass Airflow sensor on the intake tract, if not, it's a speed density system. Black smoke coming from the tail-pipe. I would like to know what driving for 5,000 miles or more without an air filter can possibly do to an engine. Depending on the make and model, your car uses either a hot-wire (the most common) or a hot. We recommend this for the M20 engines because the stock intake diameter is only 2. Also Mike was selling MAF cleaners at one point. Boss straight away say 02 sensor need to change and quote me a price. Some manufacturers use the MaP sensor to accomplish this. New spark plugs, new PCV and I ordered a used OEM MAF sensor -- the seller confirmed that it was taken out from a car with no CEL On and without the previous history fault code -- just for 14 dollars -- I am sure I can take a chance on that amount. Then you know what you have. I remember reading that some people clean their MAF sensor but just wondering how as i wana see if it makes a difference as my engine feels a bit rough after 52000 miles!! thanks people. The MAF sensor in your car dictates a lot of important things about your car's behavior, so it's best that it works properly. I read someone's thread about a newly installed MAF Sensor. The symptoms are a "stumble" and what feels like an erratic loss of power when cruising around at partial throttle. This function probably helps most with a GM MAF setup run straight to the ECU using ECMLink's GM MAF integration option. I used the car for my daily commute without adjusting any driving behavior and the check-engine light came back three days later screaming the same thing, P0171. Fortunately, detecting bad MAF sensor symptoms is not rocket science. These come in a variety of shapes and sizes, depending on the vehicle manufacturer. Sometimes you can unplug the MAF sensor when the engine is running, doing this should just about stop the engine from running. We highly recommend including a fresh, new rubber intake boot with the installation of your MAF sensor. The MAF sensor is located before the engine’s inlet manifold and after the air filter, and its signal is interpreted in grams per second flow rate. Mixture adjustment on a Rover 3. Yes You can drive the car with the MAF unplugged. Lincoln car, truck, or SUV owners have grown accustomed to a certain level of a reputation for strength when driving their Mark VIII around town. 7 ive replaced everything also at 1500 rpms it sounds like it has a bad [non-permissible content removed] cam in it anything lower or higher than that runs fine except it wants to stall at idle but if i unplug the alternator plug it still has a surge but not as bad plus i just replaced the alternator 2 days ago and ran new power and ground wires to a. Please note, this is not to say running without a cat is good for the environment. A mass air flow can cause a vehicle to stall, hard start, hiccup, hesitation, transmission shift delay. Any opinions or advice given here amount to "armchair quarterbacking" since we don't have access to the car. Not tightening the battery’s terminal connections after installing an intake: Every time the battery’s cables make adequate contact with the terminals, damaging voltage spikes can be created, potentially frying your mass air flow sensor Driving through puddles or torrential downpours with a low-slung cold air intake installed and not using. How does the oxygen sensor in a car work? Image Gallery: Engines The amount of oxygen the engine can pull in depends on factors such as the altitude and the temperature of the air and engine. There is a lot of discussion out there about only buying the official LR OEM sensor. - Check all the intake for any leaks, from the MAF to the intake plenum. LISTEN for air noise around MAF sensor and throttle body while engine is running. Do engines absolutely need an O2 sensor to function properly? other sensors readings like the Maf/Map sensor. Not only is a failed sensor irritating, it can also be dangerous. If you're experiencing bad MAF sensor symptoms, AutoZone is the one stop shop for all the replacement parts you need. If a mechanic or dealership claims excess oil from a K&N Engineering Lifetime Air Filter caused a Mass Air Flow sensor (MAF) failure, it's not true. Can we go on without it? what will be the long time effect?. 3 Most Common Bad MAF Sensor Symptoms. In these vehicles, they have a MAF sensor for their primary load sensor. Therefore, in most modern vehicles a car can run just fine without a cat. - Change the K&N back to the OEM paper. What is a Mass Air Flow (MAF) sensor? A MAF sensor monitors the temperature and weight of air entering your engine. As I was running VPC before this, I haven't run a MAF in several years. Installation was pain free and was a comfortable fit without having to modify or use any additional resources. If it was > 128 you'll want to make it higher. There would be a Intake Air Temperature sensor that is located in the rubber boot to the throttle body. As need to order the sensor, i went off without fixing first. It's important to keep your MAF sensor clean so it operates properly. With the engine running at idle, use a DVOM to verify there is at least 10. I don't believe in coincidences, so my guess is that your K&N filter and the MAF cleaner killed your Mass Airflow Sensor. The MAF sensor is a critical sensor used by the ECU to measure the actual amount of air flowing into the engine. The intake, MAF housing, or something else in the intake has been changed and is causing more/less air to pass the MAF sensor without an increase in MAF sensor voltage; There is no other reason to touch the MAF scaling, so if you have not touched your intake, MAF housing, or anything else that effect the them, DO NOT touch the MAF scaling table. A MAF sensor needs to run properly because the ECU needs information about the amount of air in the engine. A mass air flow sensor usually costs $180 to $284 and are sold individually. Based on recomondations from this site it is probably either the MAF sensor or the VGT Solenoid. P0161 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2) Mass Air Flow (MAF) Codes. MAF Should have 3-4 wires. - Change the MAF. Put simply a MAF Sensor is designed. Gadgets 6 Levels of Knife Making: Easy to Complex. There's a small army of sensors that regulate vehicle operation and performance (or lack thereof), including the manifold absolute pressure, or MAP sensor. I contacted Driving source for a new MAF sensor. I'm not sure how it got past the filter, I may have put it on hastily the last time I removed it, but once the MAF sensor was cleaned the car ran perfectly. Fixing the mass air flow sensor in your Corvette when it kicks a code 36. Likewise, the 85-89 setups do not use a MAP sensor. To put it simply what's happening is the Mass Airflow Sensor (MAF) is calibrated to expect outside air temperatures and temperature change rates within a specified range. 9 V (low oxygen, rich mixture). This can cause extreme flooding or make the engine run extremely fuel rich and this will destroy your exhaust catalysts. The one you did and the current one has the same two entries for MAF. The ECU determines a specific amount of fuel to inject based on the expectation of this air being present. Requirements. First check the MAF housing to see if there is a sample tube. The MAP sensor's job is to determine the load being placed on the engine and deliver fuel to the engine accordingly. The B2S1 sensor is the one on the front bank of cylinders. Do you think If I increase the air gap in the box a little it will mess with the sensors? I've no clue how to tune the MAF sensor as you mentioned above and don't intend to. Mass airflow sensor problems can cause a variety of symptoms from the annoying to the must repair. If an O2 sensor is not functioning, your car is winging it and might run horribly or not at all. Lately I noticed when driving engine sometimes seems to loose power alltogether, but then again it kicks in and drives normally. Leave it disconnected for too long without getting it fixed can start to foul spark plugs and will have other different driving issues. Person reidentification in a camera network is a valuable yet challenging problem to solve. car is doing what it did back in late spring, running rich intermittently, blowing black smoke and dying without the gas pedal. - Change the K&N back to the OEM paper. As regards the bellowing black smoke and serious loss of power, these symptoms remind me of a time when my car had an egr valve stuck open. Brands offer different variants when it comes to design and packaging. However, some vehicles that have both types of sensor respond better treating the MAP, so if your vehicle has both sensor types, and your treatment of the MAF hasn't gotten you results, try the treating the MAP instead. And of course after you are done with the maf table calibration to complete the tuning process you will need to set the high rpm disable back to 4,000 or wherever you would rather the ecu start to prefer the maf sensor over the map sensor and then you will want to turn back on the COT, DFCO, and PE. Just traded my 2016 4 Runner in for a 2019 TRD Off Road today. MAF sensor circuit range/performance problem ON 2 CCM × (See DTC P0101 ) P0102 MAF sensor circuit low input ON 1 CCM × (See DTC P0102 ) P0103 MAF sensor circuit high input ON 1 CCM × (See DTC P0103 ) P0107 BARO sensor circuit low input ON 1 CCM × (See DTC P0107 ). Do this after the VE table has been corrected. We offer Ford Mustang performance MAF sensors designed to measure this air flow and maintain it at an optimal level. This is a discussion on Better idle with Mass Airflow Sensor unplugged within the General Help forums, part of the LSx Technical Help Section category; I have been chasing down an idle problem and decided to unplug the MAF to see if it would run. and my girlfriend was driving me around I understand the engine will run off the o2 sensor for A/F. My maf is now nackerd to the point that it makes the car undrivable. You can also try spraying the wires in the sensor with some carb cleaner. There would be a Intake Air Temperature sensor that is located in the rubber boot to the throttle body. If this air is vented, the car will run rich. This Site Was Built With You In Mind! What is a Bad Oxygen Sensor? by Eddie Carrara. There are various designs of MAF sensors, but the most common by far is the hot wire MAF sensor. Electronic fuel injection systems using MAF metering have a mass air flow sensor. That could be caused by low fuel pressure, but the engine continues running smoothly even at WOT. The mass air flow (MAF) sensor is integrated with the inlet air temperature (IAT) sensor. This is vital information for controlling the fuel mixture. So, what will happen if I keep driving with the MAF unplugged? Its definitly driveable. I want to say that the Honda 4cyl in your car does not have one. A MAF sensor constantly measures the amount and density of the air entering the engine so the computer knows how much gasoline to inject into each cylinder. Driving around with MAF disconnected! TDI 101. Once we disconnected it, everything started to work fine again. My Mass Air Flow sensor and the car was stalling all the time. In fact that is one of the test you can do to determine if the MAF is bad, if the car stumbles doesn't run right with it plugged in and maybe you have a 121 code, unplug it and if it runs OK then pretty sure bet the MAF is bad. The P0104 code will not prevent the car from driving unless the leak is very large. Depending on the make and model, your car uses either a hot-wire (the most common) or a hot. What a dying Mass Airflow Sensor looks and feels like Very nice. vehicles, these fault codes may be read by switching the ignition switch to position II and observing the fuel injection fault display unit, which is located underneath the right hand front seat, adjacent to the ECM. The URD MAF Sensor Calibrator intercepts the signal from the Mass Airflow Sensor and remaps it optimizing the fuel mixture for the best power and performance. If there is no MAF you will be getting all kinds of misfires and very bad fuel economy. Once we disconnected it, everything started to work fine again. There's a small army of sensors that regulate vehicle operation and performance (or lack thereof), including the manifold absolute pressure, or MAP sensor. Hi All, My r170 slk230 has started to suffer with the following driving issues. After driving it around town today and tonight, I must say that the Z's ready to kill once again! I hope that this helps everyone who has been having similar problems. When the flow of air enters the fuel injection system of the engine, the mass air flow sensor will analyze how much air is flowing in there. *2: Also inspect and adjust the power steering and air conditioner drive belts, if installed. If using a MAF sensor, gently clean its filaments with a cotton swab dipped in rubbing alcohol. While a new MAF sensor was not necessary (and a wrong diagnosis had initially been made) it had helped to find the root cause much quicker, without damaging the O2 sensor. How to clean MAF and MAP inner part of the shown part without removing the intake manifold? because all the carbon/sludge will enter the engine along with carb. I changed 02 sensor on bank 1 and spark plugs, ignition coil and ignition coil leads, but it is still doing the same. edu is a platform for academics to share research papers. What happens if you start a car without the mass air flow sensor connected Tell If You Really Need a Mass Air Flow Sensor | Auto What happens if I run my engine without air. Check the connector for a correct fit and good contact. MAF Tuning – In Work 1. It will be a domino effect so to speak. How To Test Your MAF (Mass Air Flow Sensor) & HOW to Find A Vacuum Leak. Mass Air Flow Problem. Signs of a failing MAF sensor. This way, you will be able to take maximum benefits of all performance upgrades. Now i thought the engine would need this sensor to run properly, but it seems run much much better without. This is a discussion on Better idle with Mass Airflow Sensor unplugged within the General Help forums, part of the LSx Technical Help Section category; I have been chasing down an idle problem and decided to unplug the MAF to see if it would run. As need to order the sensor, i went off without fixing first. Lost power on my X. Here is how to clean the MAF sensor and throttle body in your Mercedes-Benz w204. This function probably helps most with a GM MAF setup run straight to the ECU using ECMLink's GM MAF integration option. If a mechanic or dealership claims excess oil from a K&N Engineering Lifetime Air Filter caused a Mass Air Flow sensor (MAF) failure, it's not true. 3 Most Common Bad MAF Sensor Symptoms. Learn about this problem, why it occurs, and how to fix it. Cruz P Matias April 8, 2018. If your car is smoking or making a unusual noise and the check engine light is on, it may indicate engine trouble. Basically, the MAF sensor—also known as airflow meter—measures the amount of air flowing into the engine through the air cleaner assembly, which contains the air filter and connects to the throttle body. 1V with engine off. If this air is vented, the car will run rich. It looks pretty sure i'll need to replace it, but what happens if i leave it unplugged for now?. As need to order the sensor, i went off without fixing first. My maf is now nackerd to the point that it makes the car undrivable. The same can happen when adding boost to a speed density system where the MAP sensor only has one bar of range. 5" inlet and a 3" outlet. Well I used a CodeScout OBDII scan tool to read the fault code. Much cheaper than buying from the stealers here! In my case, when I disconnect the MAF sensor, you feel much more power low down. One is the one you started with RR and cleaning info in a PDF, but I read it again and could not find the Bosch thing. Do this after the VE table has been corrected. Then say is MAF sensor dirty or faulty, he proceed to clean sensor. Air Flow Meters measure the amount of air passing into the engine from which the computer can work out how much fuel to add to get the perfect mixture for that specific throttle opening, the computer does this by referring to a map in its memory. The prices vary based on where you go for servicing and what kind of car you have. BTW, I am making a video of how to use it. If it doesn't know that, it can't compute how much fuel to inject. and my girlfriend was driving me around I understand the engine will run off the o2 sensor for A/F. I was told it is a problem with the accelerator pedal position sensor. Understanding what your MAF sensor does can help you know its importance and in turn, make you inspect the problem sooner, if you notice any failure symptoms. This entire functioning is important for the complete combustion of fuel in the engine. When the weather warms up to above 75 it stops coding the MAF sensor! I am just living with the blinking lights for now! I have uninstalled and re installed 2 times, both times with zero gap to the fender wall. You're driving home from work one day when the check engine light pops on. Some mass air flow sensors literally integrate the IAT and BARO into one single part, while others just use the IAT and BARO information to calculate the mass keeping each sensor independent. This time cleaning the MAF sensor didn't help, so I removed and cleaned the throttle body which was pretty dirty and that fixed the problem. The hybrid V6 has a MAF, I think the 4 cylinder went to a MAF in '05 and when they went to drive by wire. It's funny the information you learn when you stop driving VWs. Increasing the airflow into your Mustang's 5. most tuners ive spoken with say to stay away from the slp and granatelli mafs. Installation was pain free and was a comfortable fit without having to modify or use any additional resources. As stated before, the Mass Air Flow Test is a very easy and simple test but there are a couple of things that. The CEL comes on almost always when turning on the car, not while driving with a warmed up engine). You would need to get one from the dealership but I strongly suggest diagnosing it first since they are expensive. The operating voltage range is 9 -7 Volt, and the output voltage of the mass air flow sensor (voltage to the DME control module) lies between O and 5 Volt. The tiny thing that keeps your car working, often falls prey to regular wear and tear, and therefore must be taken care of. Incoming search terms: Can Car Work Without O2 Sensors,Can You Drive Without O2 Sensors,Can You Run Without O2 Sensors,Can A Car Drive With The O2 Sensor Missing,Can I Drive My Chevy K1500 With The Oxygen Sensor Unhooked,Can I Drive Without O2 Sensors,Can I Run My 4 6 Wirhout O2 Sensor,Can You Drice With O2 Sensor Out,Can You Drive A Car Short. I'm not sure how it got past the filter, I may have put it on hastily the last time I removed it, but once the MAF sensor was cleaned the car ran perfectly. If a mechanic or dealership claims excess oil from a K&N Engineering Lifetime Air Filter caused a Mass Air Flow sensor (MAF) failure, it's not true. DPFE Sensor and EGR Information. Sensor Web is governed by the set of standards, called Sensor Web Enablement (SWE), developed by the Open Geospatial Consortium (OGC). I do not ever recall seeing a picture of the inside of one so here is one now. You need: 1. Understanding how oxygen sensors work will help you diagnose problems without having to rely completely on a repair shop. Mass or Volume Air Flow Circuit Low. Was driving and car shut off without warning. If a mechanic or dealership claims excess oil from a K&N Engineering Lifetime Air Filter caused a Mass Air Flow sensor (MAF) failure, it's not true. technically your car can run without the MAF but instead of relying on the sensor input for the fuel trim (most optimum) it will rely on a set of pre-defined fuel trim. Air passing over the hot wire causes it to cool. Driving without MAF Discussion in 'Engine The reason i ask this is that i have tried another sensor but it was a cheapie off Ebay which gave the same errors as. But, it is really easy to do. Driving home last night was CRAZY. Without a MAF, you get open loop control, which still works okay. My Mass Air Flow sensor and the car was stalling all the time. Car runs better with unplugged MAF. Good luck to you and keep us posted please. Hot-wire MAF sensor is the most. A faulty MAF can cause many problems. That would give him a table that he could nearly drop in, check, and move right to MAF tuning. With OBD II standards, vehicle manufacturers were required to test the exhaust gas recirculation (EGR) valve for functionality during driving. I have been told that the motor in my crossfire has both a MAF sensor and a MAP sensor. I'm sure it'll give a MAF code since I drove with it unplugged. The sensor measures the air coming into the engine, and the EFI system's computer uses that information to determine how much fuel to deliver into each cylinder. Since the density of air changes with temperature and pressure (due to ambient temperature, altitude), the ECU needs this information to provide the correct fuel mass to the engine. I remember reading that some people clean their MAF sensor but just wondering how as i wana see if it makes a difference as my engine feels a bit rough after 52000 miles!! thanks people. It is not advisable to drive your vehicle with the MAP (manifold absolute pressure) sensor disconnected. This function probably helps most with a GM MAF setup run straight to the ECU using ECMLink's GM MAF integration option. Check the connector for a correct fit and good contact. A bad MAF sensor can cause some idle issues, backfire, not wanting to rev, bad gas mileage or lack of power in some cases. Next day, went to workshop B, the boss plug in a handheld device. TUNING – SPEED DENSITY vs MAF BD Turnkey Engines will be SHIPPED with a Speed-Density / CLOSED Loop tune This topic is VERY debatable. The car runs way to high idle. maf measures the amount of air taken into your car. GO to DH18. In fact that is one of the test you can do to determine if the MAF is bad, if the car stumbles doesn't run right with it plugged in and maybe you have a 121 code, unplug it and if it runs OK then pretty sure bet the MAF is bad. Genuine OEM Part. Fix MAF sensor back, he say faulty. in order to be able to post messages on the chevy trailblazer, trailblazer ss and gmc envoy forum forums, you must first. I remember reading that some people clean their MAF sensor but just wondering how as i wana see if it makes a difference as my engine feels a bit rough after 52000 miles!! thanks people. 1 wire is ~1-5v out. A Mass Air Flow Sensor is not so cheap but it is not very expensive either. i went with a z06 maf when i installed my 90/90 and semi-hardcore intake - which again is the same as the LS2 maf - but w/o screen. For many people, all it requires is taking off a few plastic pieces unscrewing a few bolts and replacing the sensor. Mass air flow hooked up car wont run unplug it car runs fine - Answered by a verified Mitsubishi Mechanic We use cookies to give you the best possible experience on our website. All this changes your particular engines VE and the MAF may not detect this change in airflow. Make sure it is the correct one for your car, which is e-gas. Mass Air Flow Sensor Replacement Cost Comparison Your Mechanic. Cars can have either an analog or digital mass air flow sensor. After driving around approximately 80 miles the BCM had tuned itself to accommodate the new MAF sensor (You can verify this with a good scan tool or even a $30 bluetooth OBDII Reader). So, what will happen if I keep driving with the MAF unplugged? Its definitly driveable. I go to start the car , It turns over starts then stalls. The tricky thing with some of these types of faults is that you can have a mass air flow sensor concern without triggering the check engine light. The MAF sensor contains a sensing element that is either a “hot wire” or a “vane meter” to measure the volume of air entering your engine. The MAF sensor is the only variable I can find between it. It will be a domino effect so to speak. My Mass Air Flow sensor and the car was stalling all the time. maybe contributing?) i. GO to DH18. Some vehicles have both a MAP and a MAF sensor. There are various designs of MAF sensors, but the most common by far is the hot wire MAF sensor. Can we go on without it? what will be the long time effect?. OBD-II PIDs (On-board diagnostics Parameter IDs) are codes used to request data from a vehicle, used as a diagnostic tool. Is it ok to drive with it disconnected for the period of time it takes to get a replacement (days/couple of weeks) or will it cause problems?. On the gauge cluster, to the top left there are a few idiot lights which are not on under normal driving conditions. These used a mass air flow sensor to calculate air being drawn into the engine. Many types of problems may cause this light to come on, so you must have your car’s computer analyzed to see if the light is related to the mass airflow sensor. MAF Scaling - Open/Closed Loop Fueling info MAF (mass Air Flow) Sensor Scaling - Open/closed loop Fuelling Disclaimer : I am not a tuner. it is driving about 35 mph at light load (just cruising), or idling, the mass air flow sensor lets out a nasty buzzing sound. Also, modified intakes will not be as effective as presumed unless the flow changes are calculated also. Car & Truck Air Mass Airflow Sensor (MAF Sensor)s Delivery Sensors, Car & Truck Air Oxygen Sensors Delivery Sensors for Nissan, Car & Truck Air Oxygen Sensors Delivery Sensors, Air Intake & Fuel Delivery Sensors for Toyota Hilux, Car & Truck Air Mass Airflow Sensor (MAF Sensor)s Delivery Sensors without Custom Bundle,.