Question about 2000 Chevrolet Blazer

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Thumping sound under gas pedal at higher speeds after taking foot off gas pedal.

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Check your motor mounts.

Posted on Jul 20, 2010

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Posted on Jan 02, 2017

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1 Answer

Car stalls when foot off gas pedel does not hold idle


these trucks are equipped with an idle speed control motor. What you're describing sounds like that part has stopped working. The part is designed to maintain idle when gas pedal is released. Now if you hear an audible hissing noise under the hood, then theres a vacuum leak which can cause the same problem, but it sounds like the idle control motor. Good luck.

May 08, 2014 | 1999 Ford Explorer

1 Answer

Wont start


If you can keep giving it gas and it runs above idle with no problem, then you have a blocked or bad idle control valve on the throttle body assembly. With your foot off the gas pedal, the large throttle plate inside the throttle assembly is closed, but some air is let in through the idle control valve or motor through a separate passage. This can get clogged with deposits over time and poor idle results. The valve is controlled by the engine computer. It is how the computer controls idle speed- more air if the idle control valve is opened wider, higher idle speed.

"...like its not getting any gas..." Oh yeah, it's getting gas, the injectors are still pumping gas into the cylinders, but it may not be getting any air. All the accelerator pedal does is control the air supply into the engine through the throttle body. So modern cars have an air pedal, not a gas pedal. Then the computer takes over and matches the correct amount of gas through the injectors to the known supply of air in the intake manifold. Neat system, eh? Sorry if I sound so pedantic, dale. check your idle control valve.

Apr 20, 2014 | 1997 Mitsubishi Galant

1 Answer

Good morning :) We recently bought a 2005 Acura


You may want to check into a recall!! If the problem occurs during accleration between 20-40 mph, Call your local dealer.

Mar 31, 2011 | 2005 Acura MDX

1 Answer

I have a 1994 Honda Accord 4 door v6. I have rough idle when in drive and smooth idle when in neutral. Also rough take offs from a stop or slow speeds. If I pump the gas pedal a few time the rough take...


  • does the engine miss? bumps is a rythmic pattern?
  • an engine miss will appear to diminish at higher rpm due to centrifical force.
  • other possible problem broken or flat motor mount.
  • is the idle rough in reverse?
  • if not
  • open hood
  • start engine
  • Left foot on brake (hard)
  • start engine
  • watch engine as you select drive
  • still holding brake with left foot / throttle gas with right foot
  • does engine dramatically move?
  • if so replace motor mount on offending side
  • if not possible engine miss or transmission problems

Jul 10, 2010 | 1994 Honda Accord

1 Answer

Car will not start without pressing gas pedal to keep idle speed up. If I keep idle at 900 RPM or higher it runs as long as foot is on gas pedal. It then stalls out when I take foot off gas pedal. No...


Have the idle bypass valve checked, also called idle air control valve.
If that valve is stuck in the closed position, it's not allowing the fuel to bypass the throttle plate to keep it idling, resulting in stalling, but will keep engine running if the pedal is pushed down.

May 14, 2010 | 2000 Toyota Camry Solara

1 Answer

Car will stall when you take your foot off the gas


SCAN CAR SOUND LIKE IDLE SPEED CONTROL PROBLEMS.

May 12, 2010 | 2000 Oldsmobile Alero

1 Answer

Sound when i take my leg off the gas pedal


I could be more helpful if you would be more specific. Is it a front-wheel drive? Is it a squeaking or thumping sound?

Jan 21, 2009 | 1988 Audi 80

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