Question about 1999 Pontiac Montana

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No engine RPM or power above 3500RPM.

Runs better with the mass air flow sensor disconnected. but free engine it won't rev up above 3800RPM

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Scan for computer error codes and post them so I can see them. Most of the chain type auto parts stores will do a scan for free. Try cleaning the MAF, but note that the contacts on the MAF are very delicate. DON'T TOUCH THEM WITH ANYTHING!!! Use only "CRC" MAF cleaner and be sure to follow ALL instructions on the can.

Posted on Dec 27, 2008

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Why would my vehicle have no power from stop


disconnect the mass air flow sensor located on the intake duct directly in front of the throttle body. take it for a ride to see if it runs better. if so, replace the sensor

May 26, 2014 | 1999 Ford Explorer

1 Answer

Vectra 1.6 16v will not rev above 3000 rpm


I recently had the same problem with my transit connect.
Does the power judder at all?
The fault turned out to be the fuel pump.

Feb 02, 2014 | Cars & Trucks

1 Answer

I have a 2000 excursion and sometimes wen I accelerate it starts chocking out at 2000 rpm and won't go any higher


Mostly your MAF MASS AIR FLOW SENSOR needs cleaning.
1st Disconnect the battery ground cable
then open the engine air cleaner.
  • Disconnect the MAF sensor electrical connector.
  • Release the air cleaner clamp.
  • Separate the inlet side from the outlet side of the air cleaner.
  • Remove the MAF assembly.
  • Disconnect the MAF sensor electrical connector.
  • Remove the nuts and separate the MAF sensor from the MAF sensor plate.
As shown

5_2_2012_12_14_19_pm.jpg
then follow the steps in the video.
HOW TO CLEAN A MASS AIR FLOW SENSOR

if that did not clear your engine chocking then make sure there is no Vacume leak.
hope that helps

May 01, 2012 | 2000 Ford Excursion

1 Answer

Start car is fine but once hits idle speed the engine hesitates and then dies. I disconnected the mass air flow sensor and car ran better, then hooked it back up and the engine died instantly. Is this a...


i would agree with your diagnosis. i had a similar problem with a crown victoria. disconnecting the maf sensor made it run better. i replaed the sensor and have had no problem since

May 08, 2010 | 1999 Subaru Forester

1 Answer

The eng. will not go over 2000 rpm


disconnect the throttle cable from the throttle body and try to rev the engine

if still cannot rev past 2000 then suspect MAF (mass air flow sensor) or the throttle body...remove the snorkel and check to make sure the throttle plate is moving freely

finally, if when the accelerator cable is removed and rpm's rise above 2000 then suspect the accelerator cable and/or gas pedal

Apr 05, 2010 | 2002 Jeep Liberty

1 Answer

Engine dies out above 2500 RPM, picks back up at 2000 RPM


That's a characteristic of Nissan engines when the mass airflow sensor is not working. My 1990 300ZX was set up the same way - when the mass air sensor fails, the car won't rev above 2500RPM in order to safeguard the engine. Get some air intake/throttle body cleaner and clean the mass air sensor. Get some electrical contact cleaner and clean the electrical contacts on the harness plug that plugs into the sensor. If that doesn't cure the problem, you'll need a new sensor.

The mass air sensor is in the 3-4" diameter pipe between the airbox and the throttle body.

Dec 17, 2009 | 1991 Nissan Pickup

1 Answer

Eng starts to sputter when the engine gets around 2k rpm mass air flow disconnected


You shouldn't run with the mass airflow sensor disconnected. That's probably the problem. Is it bad or shy is the mass airflow sensor disconnected?

Dec 13, 2009 | 1998 Chevrolet Tahoe

1 Answer

The car stalls out while driving sometimes,but it will start right back up with problem. Theres no engine light on, or anything else on.


. Check the Mass Air Flow Sensor voltages. Verify good battery voltage to the Mass Air Flow Sensor on the White/Black wire. Verify good grounds for the Mass Air Flow Sensor on the two Black wires - look for 0.05 volts or less to be ok. Check the output voltage from the Mass Air Flow Sensor on the White wire - specification is less than 0.5 volts key on engine off and 1.0 - 1.3 volts at warm idle. The Green/Orange wire at the Mass Air Flow Sensor is not used. The Mass Air Flow Sensor can test good and still be defective.

2. Make sure the timing belt is not off a tooth. Can check ignition timing to see if one bank is on. May need to get into compression on each bank but a timing belt off a tooth or two will idle poorly but can run better at higher RPM.

Nov 22, 2009 | 1995 Nissan Maxima

1 Answer

Engine light on, bad fuel milage


You didn't mention if you replaced the mass air flow sensor, if the tech got that code, it needs replacing, if you haven't alresdy done so.

Feb 25, 2009 | 1997 Buick.5 Regal

1 Answer

My golf 2001 tdi after 3000 rpm sometimes he cuts the acelerator


Could be a few things. IS the check engine on? Could just be a bad mass air flow sensor. Or a seized wastegate. Yuo can start by trying to unplug the mass air flow sensor. If it runs better it could be just that. Just make sure to remove and clean the lower air filter box change the air filter and the snow screen which is located next to the battery where the air enters. These always are blocked. If it runs ok (not perfect change the mass air flow.

Nov 03, 2008 | 2001 Volkswagen Golf

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