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My 05 Jetta idles high but when Mass airflow sensor is unplugged it idles normal. What can cause this

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When you unplugged it, the computer used default settings to measure incoming air, I think. Try cleaning (gently) the MAF sensor with MAF sensor cleaner, or a suitable sensor- safe spray cleaner..

Posted on Dec 04, 2012


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Posted on Jan 02, 2017

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SOURCE: transmission won't shift

Throttle position sensor

Posted on Jan 07, 2009

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Very easy for the Mass Air Flow is in the duct between the throttle body and the air filter box. Just unclamp the tube and remove the old and replace with the new.


On your pack....I need the engine size.

Posted on Mar 26, 2009

  • 79077 Answers

SOURCE: Need location of IAT sensor on 05 F150 5.4L

the IAT is a small round sensor with 2 wire going to it, the sensor is located in the air filter housing lid or in the flexible air intake hose to the engine from the air cleaner box.

here is a picture

Posted on Mar 30, 2009

  • 167 Answers

SOURCE: 95 nissan maxima 3.0. have replaced knock sensor

I would have the charging system checked for over-voltage and AC ripple. There maybe a hidden wire harness problem if the charging system is okay. Wiggle test the wire harness while the engine is running to help locate the problem area. That is way to many parts replaced.

Posted on Oct 28, 2009

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SOURCE: I have a 1991 Buick Park Avenue. Runs rough in

Here are the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.
To correct this problem I want you to get a can of intake cleaner (ABOUT $5.00) from any local auto parts store like NAPA or Carquest, do not use carburetor spray, intake cleaner only or u will damage the Teflon coating inside the throttle valve and air bypass valve, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Posted on May 25, 2010

Testimonial: "Thank you, I'm sure if your advice it was I'm looking for. But at least if this works, it will save me a lot money from having to replace expensive sensors."

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My 05 Cadillac STS 4.6L wont stay running unless foot is on the gas...

Check the IAC (idle air control) motor, the TPS (throttle position sensor) and the EGR valve - any one of these can cause the problem, but I would carefully check the IAC first (they often stick or fail due to heavy buildup on the plunger and/or a plugged air gallery).

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If it idles up and down real high, its the throttle body sensor. If it's a low up and down idle and runs rough it is mass air flow meter. If you unplug the mass airflow meter and it will just low idle (no up & down) then the mass air flow meter is bad.

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Idles high and low

Although it could be any number of things you may want to start with the air filter, a dirty air filter restricts the airflow to the engine and can cause exactly what you have described.

3 other suspects could be, Idle air control valve, mass airflow sensor, or throttle position sensor.

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I have 2000 VW Jetta 1.8 turbo, my car stumbles on acceleration, but run smooth at idle. I removed the air intake from the mass airflow sensor and the car died. Is the turbo bad or do I have another...

If you remove the mass air flow sensor then the car is getting to much air and the reason that it is dying is that the ECU is set for the engine to run with a specific air to fuel ratio, and if you have removed the breather element. or air filter then that can cause the slow or sluggish acceleration.

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My 1997 jetta stalling, after coming to astop. changed airflow mass censor,wires last year,distributer cap and fuel pump.please what could be happening?

it's very hard to diagnose without being there but one thing that you may want to check is the rubber piece between the Mass airflow sensor and the intake. If it has a crack or tear in it the vacuum leak will cause false air to enter the intake without passing through the airflow sensor. This will make it stall at idle or when the RPMs are at their lowest. The other guess would be another defective MAF sensor. Possible if you got a used one.

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1996 explorer 4.0 181000 miles ... cranks and idles fine try to accerlerate it dies... cranks right back up .. making a humming noise through the breather... replaced mass airflow sensor and the check...

check for a leak in the air duct between the air filter box and the throttle body. When the mass airflow sensor was replaced you may have failed to get tight connections and any leak in this ductwork will cause problems with driveability. Also check for any thin or soft ruber spots in hoses between PCV valve and the intake. Any holes in these will cause the vehicle to run poorly but normally would be noticed at idle also.

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Six cyl high idle. already replaced tps

the problem could also be caused by a bad mass airflow sensor. you may be able to get one cheap at a junk yard.

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check you throttle positioning sensor, also check your mass air flow sensor, by unplugging while your motor is running if idle returns to normal that may be the prob. hope i could help

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