Main IndexAuto Repair Home Search Posts SEARCH
Who's Online WHO'S
Log in LOG

pontiac grand am low idle

  Email This Post

New User

Mar 29, 2010, 1:37 PM

Post #1 of 4 (6718 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
Sidom profile image

Mar 29, 2010, 7:51 PM

Post #2 of 4 (6703 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, 8:13 AM

Post #3 of 4 (6697 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
Sidom profile image

Mar 31, 2010, 8:15 PM

Post #4 of 4 (6689 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

  Email This Post

Latest Forum Post

Hi Everybody! My names Joey. I've been a self taught mechanic for about 20 yrs....

I have been working on this thing for 3 days straight and can't for the life of ...

I have a 2006 Nissan Altima, I've owned the car for less than a year and it's be...

 In the near future I'll be rebuilding my trans. Have always heard about sw...

My car overheats, the surge tank overflows and it goes in cycles. The car will b...

2005 Honda odyseey first I had no cabin blower so I installed a new fan resistor...

Feed Button

Automotive Forum Categories
AC Auto Repair
Auto Body Repair
Auto Insurance
Automotive Repair
Automotive Wiring
Automotive World
Brake Systems
Car Care Tips
Car Racing
Car Shows and Events
Car Stereo Repair
Car Troubleshooting
Engine and Car Noises
Engine Fault Codes
Engine Troubleshooting
Exhaust System Repair
Gasoline and Motor Oils
General Discussions
Motor Vehicle Inspection
Motorcycle ATV Repairs
Motorcycle Body Repair
Motorcycle Clutch Repair
Motorcycle Engine Repair
Motorcycle Repair
Motorcycle Seat Repair
Remote Control Cars
Steering and Suspension
The Bargin Bin
Traffic Ticket Help
Tricks of the Trade
Truck Repair
Truck Repair Advice
Truck Engine Repair
Truck Suspension Repair
Car Forum - Sitemap

Search for (options) Privacy

web statistics