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pontiac grand am low idle

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New User

Mar 29, 2010, 4:37 PM

Post #1 of 4 (4733 views)
pontiac grand am low idle Sign In

I have a pontiac grand am 2001 4 cylinder with 150000 miles on it. After car warms up when sitting at a stop light in drive the rpms will drop sometimes killing the car. It only seems to do this after the car has warmed up. I do alot of freeway driving so it isnt a huge problem but any in town driving can become tedious, i.e, always having to turn over car at stop lights. The average idle speed is between 500-600 rpms which i believe is a little low. I have put in new plugs, oil changes, battery, and fuel injector cleaner all to no avail. What could be going on here? Also I have hooked it up to a code machine and it isn't throwing any codes. Any advice would be greatly appreciated. thanks!

Veteran / Moderator

Mar 29, 2010, 10:51 PM

Post #2 of 4 (4718 views)
Re: pontiac grand am low idle [In reply to] Sign In

There could be a few things going on with. The 1st thing you can do would be to clean out the throttle body with some throttle body cleaner and a little brush. When they get too dirty the IAC can't compensate any more and you will get this type of problem..... Try that and let us know how it works out for you.


New User

Mar 31, 2010, 11:13 AM

Post #3 of 4 (4712 views)
Re: pontiac grand am low idle [In reply to] Sign In

Well... cleaned out throttle body and map sensor also replaced hose off map sensor and it is running....better. quicker start and better idle but, it is still dropping rpm after warmed up. It isn't killing the car which is an improvement but it is still doing it all the same... I'm on to something i think but now what? Any help is always greatly appreciated.
thanks again,

Veteran / Moderator

Mar 31, 2010, 11:15 PM

Post #4 of 4 (4704 views)
Re: pontiac grand am low idle [In reply to] Sign In

It's possible you could have a bad IAC motor. When you start the car the idle should raise to over 1000 rpm and then drop back to the normal range some where around 600. If it's cold it'll stay high longer....

You also have to make sure you don't have any vacuum leaks this can also give you a low idle problem and wanting to die while in gear.... Get a can of carb clean and spray around the intake manifold, throttle body gasket & hoses any raise in idle would indicate a vacuum leak.


pontiac grand am low idle

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