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Where is the maf and i think i have a vacuum leak too.

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Posted on Sep 23, 2010


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Solving lean on bank 1 and bank 2 in a suzuki grand vitara

Need codes. Could be a vacuum leak. Could be a bad MAF sensor. Bad O2 sensors, wires. Could be the intake air plenum is broken. Needs to be on a scanner to see what is wrong.

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P0171 bank 1 lean- is this a maf or o2 sensor?

could be several problems:

MAF could be dirty or faulty

exhaust leak between engine and first o2 sensor

low fuel pressure or sticking/plugged fuel injectors

failed o2 sensor

pcv valve failed or stuck open

cracked vacuum or pcv line/connection

vacuum leak downstream from MAF

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04 Grand Prix Cut out / Hesitation on acceleration between 2k and 3k rpms but not at WoT. MAF replaced, plugs, wires, o2 sensor (rear), Cat tested @500 degrees on output, throttle body replaced, unplug...

Check for a vacuum or air leak. Possibly a hose or intake manifold. Odd that it runs better on default MAF settings with MAF unplugged, but if no codes indicating a circuit problem, IDK. Could be a vacuum leak.

Feb 23, 2014 | 2004 Pontiac Grand Prix

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P0507 and P-0102

Could be a vacuum leak near MAF. or MAF is malfunctioning. Clean MAF and check for vacuum leak

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2004 vw caddy van. starts instantly cold. but cranks over for ages after stopping briefly. Also has loss of brake servo assistance occasionally after brief stop.

From what you say I would check the MAF and for any vacuum leak. Here is my reasoning. When cold the ECU sets long injection times to warm up and if the vacuum is low your fuel pressure relief valve will also be at higher pressure (reduced vacuum will not relieve the fuel pressure valve as it would normally). The result is the the extra fuel injected is balanced by the extra air due to the leak and the car starts easily. However when the engine is hot the ECU reduces injection times and the fuel mix is leaner. If the MAF is unable to read the mass of air flowing through it correctly it may set the injection to being too lean to run at idle and at restart. If there is a vacuum leak the additional air causes the engine to cut out and will like the MAF makes it difficult to restart. A quick way to check the diagnosis is, when the car next cuts out when hot, disconnect the coolant sensor before starting. This will fool the ECU into thinking the engine is cold and reset longer injection times and the car should restart that little bit easier. Reconnect the coolant sensor once the engine is running. Now switch off and try to restart with the MAF disconnected. the engine should restart if the MAF is at fault. Check that the MAF is clean and that its electrical connection is good. THe MAF can be cleaned by spraying it liberally internally with electrical spray cleaner and allowing to air dry before reassembling. Check the vacuum lines and junctions are secure. So what I have described here are two sides to the same coin. If the MAF 'sees' less air than there actually is the ECU will reduce the amount of fuel injected to 'compensate' and in the process makes the error of running the engine too lean. If there is a vacuum leak too much air actually enters the engine for the correct setting of the injectors and again the engine runs too lean. I hope this helps.

Sep 24, 2011 | 2004 Volkswagen Eurovan

2 Answers

Having codes p0171 p0174 on my 2001 expedition but dont here a leak

How is the truck running? The codes indicate a MAF related fault. A leak in the vacuum lines, as you have already worked out can bring about this code. When the engine is idling pinch the vacuum lines one at a time and take a note of how the engine sounds after about five seconds, leaks can be so small that they cannot be heard. If you are sure that everything is air-tight then time to look at the MAF directly. Again with the engine running disconnect the MAF and listen for any change in engine idle? If the MAF is bad, disconnect from the air ducting next to the air cleaner and try cleaning the heated film unit by spraying with electrical (no residue) cleaner fluid. Let it air dry before reassembling. If problem persists check the electrical connection to the MAF and if OK consider renewing the MAF. If I were you, before buying a new MAF, I would want to check the condition of the O2 sensors first; if covered in soot they will not read the correct exhaust oxygen levels and the ECU will assume the fault is with the MAF.

Sep 22, 2011 | Ford Expedition Cars & Trucks

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Have a van w/ code P0171 and pending P1131. Idea is MAf


P0171 suggests th van is running to lean on bank 1 is the cylinder bank on the RIGHT (passenger side) the plug may be defective or coil damage, no spark.

Is this a gas version or Derv / diesel ? I am assuming it's gas.

DTC P1131 indicates the system is correcting RICH for an overly LEAN condition. In english this means the car's computer is telling the fuel pump to use more fuel (running RICH) because the engine has a low air-fuel mixture (LEAN). The car is out of tune or the airflow sensor, (O2) Heated Oxygen Sensor are worn or are getting an incorrect reading.

So quite rightly it could well be the MAF sensor, and I would look there first. also, try cleaning it with carb cleaner before replacing it, and also look for any air leaks in pipes as again this could cause this.



Dec 29, 2010 | 2001 Ford Econoline

2 Answers

What do you think the chances are that a maf sensor is causing codes p0171 and p0174,causing the check engine light to come on?

Clean the MAF Sensor---CRC MAF Cleaner
The maf sensor is fairly reliable and fairly expensive.
They just repair them,so I would say no

Vacuum leaks are the most likely,causing both banks, to drive the O2 Lean

Egr Valve worth checking out

Loose O2 Sensors

Exhaust letting air in

Ducting to throttle or air filter cover loose


Nov 05, 2010 | Mercury Grand Marquis Cars & Trucks

1 Answer

Mass air flow sensor on a 1995 dodge stratus is located where?

Try to unplug maf sensor and try to start and run. ECM will go to default values. I vehicle starts and runs with sensor discoed then that is the problem. Make sure all connections for air induction between maf an intake are tight and there are no leaks. Air leaks after maf sensor will cause runability issues.

Mar 29, 2009 | 1995 Dodge Stratus

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