CNSensors

Jul 08, 2021· Yup, you will see fuel trims change with O2 unplugged. The O2 sensor is only used to verify proper catalyst operation. Fuel trims are managed in closed loop by data from the Air/Fuel Ratio sensor. When you disconnect the MAF you put the ECM in limp mode (open loop).

Jun 18, 2008· The digital 5volt signal is then converted by the PCM into the air flow rate. Normal MAF Readings at idle • Use a scan tool to look at the grams per second • Should read 3 to 7 grams per second • GM 3800 V6 should read to KHz. • If not within this range, check for false air or contamination of the sensor wire

Dec 08, 2005· when u unplug the mass air flow sensor it goes into "limp" mode and it uses a set of predetermined points on a graph. this is very bad your car could be running seriously lean considering the added amount of air flow. do not run car with it unplugged. ... 2002 · …

The mass airflow sensor helps the car to run perfectly. It is a very important component of a car. MAF is a device that helps the engine to know the exact amount of airfuel mixture that it needs for the car operate optimally. It does this by measuring the mass of air flowing through it. A faulty mass airflow sensor can lead to bad fuel economy ...

Jun 10, 2009· 626 Posts. 4 · Feb 27, 2009. Only show this user. The MAF sensor tells the computer how much air is flowing through the intake. The computer uses this information, with other input, to adjust fuel delivery. With the MAF unplugged the car is running in speed density mode, which just says (as I understand it which isn''t much) at this rpm ...

Oct 17, 2016· Mass Airflow Sensor Replacement. Get a Quote. Jay Safford. Automotive Mechanic. 16 years of experience. This is a sure sign of a shorted mass airflow sensor. The reason it starts with it off is the computer sees no mass air signal and replaces it with an internal memory fake signal to use. This will let it start and will run ...

Jan 22, 2009· How To Test The GM MAF Sensor (, , , And ) This is one of the easiest mass air flow sensors to Test. The following Test is an On Car Test that checks the performance of the MAF sensor with the engine running. You''ll test this GM MAF sensor with a multimeter that can read Hertz (Hz) Frequency.

May 17, 2016· 2002 impala 9c1, my car had a rough idle, and would die after warm up, things that were changed were all 3 coils, spark plugs and wires, map sensor, idle air control valve, convertor, fuel pump, fuel filter, throttle body was cleaned, maf sensor was cleaned. all these parts and no effect on the running of the car. took it to a trusted ...

The mass air flow (MAF) sensor, part of your vehicle’s electronic fuel injection system, is responsible for calculating the total amount of air entering the engine. A faulty MAF sensor can cause your vehicle to run too rich or run too lean. You’ll notice if the tailpipes eject black smoke or when the engine runs rough or backfires.

Mar 18, 2018· Recommended Services. Car is hard to start Inspection. Get a Quote. John Hege. Automotive Mechanic. 40 years of experience. Just because the car shuts off when you unplug the MAF, it doesn’t mean that it is bad. But it also doesn’t mean that it is good.

Dec 29, 2010· Idle roughly, but steady. At very slight throttle pressure (barely more than coasting) it can be jumpy, from 500 to 1500 rpm. Got fault code 08 Air Mass Sensor (keep in mind, this ONLY shows when MAF is disconnected. If MAF is plugged in, I get misfire codes and recently coolant thermostat jammed open.

Nov 26, 2012· 11252012, 09:52 AM. brc0703. Ford Pickup. Join Date: Sep 2012. Posts: 109. idle misfire gone when unplug MAF. so i have a misfire at idle and my mpg has dropped from about 1718 to 1415 for the last 2 tank fulls..when i unplug the mass air flow sensor it dissapears and idles smooth. tried driving like this but it shifted way too hard..

Aug 06, 2019· The mass airflow sensor (commonly abbreviated to MAF) is one of the most important engine management sensors. A bad mass airflow sensor can leave your Chevy Impala’s engine running rough, or even inoperable. A MAF sensor measures the density of the air entering the intake manifold. It passes this information onto your Impala’s ECU.

Apr 18, 2007· Car is running, but rough. So i started tracking down the possible culprit. While doing so, my buddy unplugged the maf sensor and to our amazment the car kept running, didn''t bog hesitate or ''m done working on it for the day, but would like to have an idea for when tomorrow comes.

Aug 19, 2013· Mass Air Sensor Problem. Jump to Latest Follow 1 11 of 11 Posts. L ... 2012 Impala LTZ 72,000 miles 2002 Buick Regal LS 405,000 miles daughter traded for a ford :gaah: ... With the scan tool connected and with the engine running the MAF reading is at "0", this is telling me the PCM is not reading the MAF sensor, Like I mentioned in my first ...

Mar 26, 2021· Click to see full answer Also question is, why would a car run better with the mass air flow sensor unplugged? Because either the sensor is reporting incorrect air amount and or air temperature to the ECU. By disconnecting the sensor the ECU switches to limp mode and the car may idle MAF sensor wires can be cleaned and some cannot as the wires …

SOURCE: 2002 chevy impla v6 esngine Code p0102, on either the or (3800) v6 engine is a problem in the Mass Air Flow sensor (MAF). If any work has been done to it just prior to this code, then you need to make sure the air cleaner, duct work, breather tubes, etc. are properly connected and not loose.

Aug 10, 2012· 1,071 Posts. 5 · Aug 9, 2012. If your car is running better with maf unplugged then a) ur maf was bad b) it was getting bad reading c) u have a leak in ur intake track and or pulling in unmetered air. Nothing more nothing less, check those 3 things. It sounds like ur problem is c, check for leaks in intake track (intake tube, throttle body ...

How to replace an automotive mass air flow sensor P0100, P0101, P0102, P0103 and P0104, though appearances may vary, the process is similar for most vehicles. 2001 Volvo Xc70 Vibration Engine Mechanical Problem 2001 Volvo Xc70 All Wheel Drive Automatic 84000 Miles Hello: I Recently Hit A Curb Pretty Hard.

85,239 Answers. Re: runs better with mass air flow sensor unplugged. The fuel injection control computer (PCM) subsitures the Throttle Position Signal and other info from a system called FAILURE MODE STRATEGY, your MAF has failed and the computer has gone into the failure mode, this is how I quickly determine if a MAF is bad in the shop, just ...

Jan 27, 2015· So I thought I had a bad maf sensor, and I bought a brand new unit. Replaced it, and still having issues. With the maf unplugged, the car hauls ass. No boost leaks, boost builds fine, just doesn''t pull AS strong as it would with the maf operating properly. With the maf plugged in, car builds boost until about 3500 rpm, then feels as if it opens the wastegates.

Mar 02, 2020· Also to know is, why would a car run better with the mass air flow sensor unplugged? Because either the sensor is reporting incorrect air amount and or air temperature to the ECU. By disconnecting the sensor the ECU switches to limp mode and the car may idle MAF sensor wires can be cleaned and some cannot as the wires are not easily …