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Code 34 for MAF sensor. Check engine ligh is ont, cuts out light acceleration. Will stall at stop. Have check for vacuum leaks

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  • honeymokey
    honeymokey Apr 01, 2011

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I would have the mass air flow sensor checked, it probably needs to be replaced. if it isnt working it cant send the signal to the computer to let the vehicle know how much fuel to inject.

Posted on Apr 01, 2011

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I got a code for the MAF SENSOR so I bought the piece and it cause my car to stall out. So I put the old piece in AND the car is running normal. the check engine light went off and comes on then goes off...


Code 102 means the MAF sensor is telling the computer there is very little air flow into the intake. Normally the airflow is lower at idle than when you are accelerating, but the sensor reading is lower than spec.
You could have a leaking hose between the MAF and the throttle body, or a vac leak somewhere else, the sensor could be faulty, or you could have a problem with the wiring harness.
All of these possible causes would apply to the replacement sensor that did not work.

Feb 06, 2013 | Cars & Trucks

2 Answers

99 buick regal supercharge starts fine in the morning but after accelerating cuts off


You have a MAF and MAP, The mass air flow signal varies with engine load.It is attatched to throttle body. This if it is the primary signal can cause the problem you desribe try and disconnect it and see if it idles properly. The next item you need to inspect is the MAP ,manifold air pressure this is a back up for the MAF sensor.If this sensor fails you will not accelerate correctly and stall out flooding the vehicle with fuel. This monitor the MAF and your EGR. If the EGR valve is stuck open the vehicle stumble and stall out and affect the performance of the MAF and MAP.Make sure your MAP is connected and the vacuum hose is attatch this item is located at top rear engine compartment near fuel injectors

Feb 24, 2012 | 1999 Buick Regal

2 Answers

What would cause my 2005 colorado to idle really low and if i stop at a stop light or make a sharp turn it dies what could be the cause


Hello, if your check engine light is not on & the Colorado does not have a P0506 error code....
Check every connection on the air intake between the MAF sensor and the throttle body for vacuum leaks...Remove and clean the IAC (idle air control) & the MAF (mass air flow sensor)
Do not use brake cleaner on the MAF sensor, you can purchase MAF sensor cleaner at your local parts store....I hope this helps.

Aug 25, 2011 | 2005 Chevrolet Colorado

2 Answers

My 1998 jeep grand cherokee will cut on and 5 seconds later, it will cut off??? any suggestions? and i looked on some forums and thought it could be the O2 sensor or crankshaft sensor?


It is also a possibility. Check if you have rough idling when you do get the engine running and check if can keep it running if you step on the gas. You may have a dirty idle air control valve. Check also for loose vacuum lines and wiring as well. If you have a spare carb cleaner, have it sprayed in to the intake of the engine while revving. There might be just dirt in the system or the MAF sensor.

If you can, have a scanner connected to the car. It may have errors stored in its computer.

Aug 22, 2011 | 1998 Jeep Grand Cherokee

1 Answer

Check engine light is on and car is stalling when at stop light.


Check EGR, IAC, MAF sensor or some vacuum leaks.

May 13, 2011 | 2005 Nissan Altima

2 Answers

Check engine light is on, tested with OBD reader and got P0171 system too lean bank 1 result.


There could be a vacuum leak downstream of the Mass Air Flow sensor or the Mass Air Flow Sensor is dirty or faulty. Try cleaning the MAF sensor wire elements and clear the engine computer code. After removing the MAF sensor, spray the honeycomb inside the sensor, or the air meter with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling. Inspect all vacuum and PCV hoses, and replace any vacuum hoses that have cracks, cuts, etc. If it has been a long time since you changed your Fuel filter, it may be a good time to do this as well. This could also be due to a faulty O2 Sensor.

Apr 03, 2011 | Kia Optima Cars & Trucks

1 Answer

Runs great, but stalls when you accelerate.


You need to run engine codes. It's probably not the ox sensor (that usually makes it run too rich), but could be a map (or maf) sensor malfunction. If your car has a maf sensor, there are a couple of other sensors that work with this unit.
Reading engine codes should reveal errant readings, even if your "check engine" light is not on.
The other problem is that the corrugated tube that goes to your throttle body is cracked. This will raise cain with the accuracy of your air sensor. When you accelerate, it is possible that the rocking of the engine under load spreads the crack in the bellows enough to let outside air into the system midstream. This will make your air sensor read low and will send a wrong voltage to your computer and fool the computer into thinking that the engine needs less fuel.
Check all your tubes for these vacuum leaks.

Nov 23, 2009 | 1997 Ford Windstar

2 Answers

90 chevy 1500 350 have codes 33 and34 cant find what they mean when i give the truck full throttle it goes into limp and pops the light also have an issue with cold starts


Code 33 & 34 have to do with the M.A.P. and M.A.F. sensors. I would look at the MAP sensor and vacuum hose as those were the most apt to fail on that particular year. You could also do a vacuum test off a constant vac port and see if you maintain at least 18 psi/vacuum. If not, you have a vacuum leak @ the sensor.

Aug 31, 2009 | 1990 Chevrolet Corsica

1 Answer

Check engine light code P0171 activated on my 2001 toyota corolla


p0171 is lean condition bank one. you could have a vacuum leak a bad map sensor bad maf sensor clogged fuel filter low fuel pressure. start with the vacuum leak first.

May 05, 2009 | 2001 Toyota Corolla

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