Question about 1999 Subaru Forester

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Keeps on bringing up mass air flow meter during diagnostics

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Your MAF is either dirty/restricted or has totally gone bad. Another possibility is vac leak in intake hose to MAF

Posted on Mar 23, 2011

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Run a diagnostic test to see what codes come up. Suspect the mass air flow meter.

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Air flow meter or air mass meter


The mass air flow meter is located at the air box where the air filter is housed.

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My 95 toyota tacoma, hesitates during acceleration around 2500 then takes off strong, it a 5 speed


You should know that while those problems can be caused by several issues, including low quality or altered fuel or even a loosely tighten fuel cap, the most common cause is a dirty MAF flow meter sensor.
The MAF sensor (Mass Air Flow Meter Sensor) is in charge of detecting how much air (in mass, not volume) is coming in to the engine, so the ecm computer can calculate the amount of fuel to be injected.
Some times this sensor gets contaminated by lots of microscopic debris that scape the air filter and accumulate on its sensing parts over time. The resulting effect is that the MAF flow meter sensor gets less "sensible" and detects less air than it is currently entering the engine. The reaction of the ecm computer will be to inject less fuel to keep the air fuel balance, taking as reference the false reading of the MAF flow meter sensor. This will produce a too-lean mixture, which is responsible of the hesitation, the loss in power and the check engine light.
If your car engine, besides the hesitation, is also producing knocking or engine pinging at high loads, like when going up through a hill, it is attributed to this too-lean condition.
Before going to an auto parts store or to a mechanic to fix the problem, you should try fixing it your self. If the problem is a dirty MAF flow meter sensor, the solution is to clean it, plain and simple. That may save you some money that a mechanic will charge for cleaning it (you could do the same) or for replacing the part when most of the times it is not damaged, just dirty or contaminated.

Sep 17, 2012 | Buick Cars & Trucks

1 Answer

Had Po171 code due to failed emissions test..check engine light is on..So I had the mass air flow sensor replace, bothe oxygen sensors, pcv valve, air filter and also had tune-up and check engine light is...


replace the gas cap.. unless your car loss power when u give it gas.. and when u c a hill and it does not have power.. then its not the air mass flow sensor.. however u did everything but the gas cap

Jan 16, 2012 | Cars & Trucks

1 Answer

No power jucking but can drive throw it is it the air mass meter !!!!


Your description, I venture has a number of things misspelle by accident. "Jucking" Maybe "Jerking?" But you can drive "throw" as though" it is the air mass meter.
Keep in mind, I am not making fun of you, I have made my share of misspelled words and sentances which were a little confusing.
As for the mass air flow sensor, looking at technical service bulletins, there is one which pertains to the throttle position sensor, Air Idle Contril Valve and the Mass Air Flow Meter. They reference connections which need to be checked and insured that they are clean. These can cause a balk or hesitation and stumble. False air problems can also caise the same conditions. Look for vacuum leaks. The main hose which connects the air mass meter to the throttle body may have a crack or tear in it. As you apply throttle, the engine is going the jump and shift position a little. This can cause a small to massive air leak between the air mass sensor and the throttle body. Un metered air means poor performance.

Aug 07, 2011 | 2002 Kia Sportage

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Diognostic says plugs. replaced plugs. unhooked battery, malfunction light still flickering also small miss in engine 59,500 kil


never mind the diagnostic code reader ,this miss could be anything so i would do a diagnostic check with no meter as europeon cars cannot be read with the OBDII but with my scope and volt meter ,clue first thing i would check is the mass air flow meter ,

Dec 11, 2010 | 2008 Dodge Caliber

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Hi there,i have a c200 elegance 2005,i seem to be having problem after problem and my pride and joy is becoming a money pit!! well here goes,it wont rev past 3000 revs, i was told this would be the mass...


You must be having a check engine light or maintenance coming up on the dashboard, if yes the best way to start troubleshooting this problem is to run a diagnostic test on the vehicle.Also after changing the mass air flow meter did you reset the ECM ?If not then this is required after any repair you do.Hope this helps.

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2001 XC70 Shutsdown after startup. When driving the car shutdown, was restarted a few times to get to a parking lot. After parking, car will start for 2-3 seconds and shutoff.


Try to unplug the mass air flow meter. The mass air flow meter is atached to the air filter housing on the left of the engine bay at the front edge (left side when sitting in the drivers seat). It will be a somewhat flat 5 or 6 pin connector that mounts to the air box on one side and goes to the black air intake tube that goes down to the back of the engine.

Do it with the key off of course. With the mass air flow meter unplugged start the car and see if it will idle. if it does the mass air flow meter is bad. If the car will still not run then there is a good chance the Eletronic Throttle Module (ETM) is failing. The ETM is under an extended waranty from Volvo for 10 years or 200,000 miles.

I would suggest taking it to a garage or directly to the dealer.

Of course there are numerous other things it could be, but the Mass Air Flow Meter and the ETM are the most likely.


hope this helps.

Feb 28, 2009 | 2002 Volvo V70

1 Answer

Try to find a mass air flow meter for a trans am 02


I think what you might mean is....a MAF or a MAP...Mass air flow sensor, and a Manifold absolute pressure sensor. MAFM may refer to a Mass air flow meter....PHB

Dec 20, 2008 | 1992 Buick Park Avenue

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