Question about Pontiac Grand Am

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I have a 2000 Pontiac Grand Am and it recently started shutting off SPECIFICALLY when I'm braking or slowing down. The idling drops really low like 200-300 rpm then cuts off or sometimes it boosts itself back up and my car vibrates and shakes for 2 seconds. I have no codes (tested by 3 diff places) and no check engine light, although service vehicle soon (which is different from service engine) is on. So far I've have a 3step fuel cleaner process and my IAC valve replaced...which is $185 I'm out of because its still doing it. Please HELP!

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  • Pontiac Master
  • 44,295 Answers

Simple test if you have a vacuum brake booster
put the hand brake on and start the engine
if it idles bad --possible vacuum leak from gaskets , vent controls sensor problems
if it idles fine , put the foot on the brake
if it idles bad now -- replace the brake booster

Posted on May 02, 2017

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cbaroni78
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SOURCE: high idle 1997 Madza 626 4 cylinder auto transamission

The PCM controls idle speed to ensure good driveability. The PCM will only attempt to maintain the desired idle speed when it “knows” the throttle is closed. A throttle switch or the TPS input is used to determine when the throttle is in the idle position. Motors and solenoids are used by most PCM’s to control idle speed. Many PCM’s are programmed to attempt to control the idle speed by adjusting spark timing and then by controlling the idle speed actuator. Some computers of the early 80's did not control idle speed.

Posted on Oct 19, 2008

  • 1 Answer

SOURCE: Engine vibrates, shakes car at 1700 rpm, smooth at 2000 rpm

Something similar happened to my van, and it ended up being that I needed to replace a tie rod in one of my wheels. Hope this helps! I know this was posted awhile ago.

Posted on Dec 28, 2008

  • 132 Answers

SOURCE: IAC VAlve on 2001 Mitusbishi Mirage DE 2 door 145,000

I would try to clean the IAC with a little CHEMTOOL and see if that helps first.

Posted on Feb 07, 2009

  • 36 Answers

SOURCE: 2000 pontiac grand prix starts and dies

check the pcv valve and or the mass air flow

Posted on Mar 31, 2009

ourhowse
  • 2007 Answers

SOURCE: 1998 toyota corolla shakes before 2 rpm, check engine lights up

Not sure what is causing it, but it sounds like you're running on 3 cyllinders. Check plugs, wires, timing . timing belt may have jumped, bad injector, low fuel pressure.

Posted on May 13, 2009

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1 Answer

I have a 2001 Grand Prix. Last week my rpms


There are many possible issues here. It could just be that the idle is set too low. Could be weak spark, fuel delivery, charging system, etc... Get it to a mechanic to diagnose it for sure. They should do that for free at least.

Oct 15, 2014 | 2001 Pontiac Grand Prix

1 Answer

2000 Pontiac Grand Prix starts up and shuts down.


Check the IAC (Idle Air Control). Usually found on the air intake.

Oct 27, 2013 | 2000 Pontiac Grand Prix

1 Answer

What's wrong when the rpm jumps in idle and the car shuts off when slowing down or at a stop ? I changed the maf sensor and the air filter, and now it hasn't shut off on me yet.


may be you should make a diagnostic and you can do it in a garage or you can do it by yourself if you want to do it by yourself you need some tools and you can find some good ones here: diyobd2.fr

Mar 23, 2013 | 2000 Pontiac Grand Prix

1 Answer

Why should the truck shut down at a low idle or when u apply the brake to it the idle slows down an it cuts off on a 1992 ford f150


In some cases, the throttle body is dirty or the iac valve is faulty.
I would start with those two things.

Oct 11, 2012 | 1992 Ford F150 SuperCab

1 Answer

2004 Pontiac Grand Prix Temp Gauge not working and car not running properly.


I would check the coolant temp. sensor it should be in the head and have one wire on it. The manufacturers program the computers to change the air fuel mixture, and idle higher when the engine is cold. If the engine is at normal temp and the computer thinks its not it could be idling it up to bring it to proper operating temp.

Jan 19, 2012 | 2004 Pontiac Grand Prix

1 Answer

My 1989 Daihatsu Charade CLS (3 Cylinder) has a low idle


The E-brake light is on because the brake is slightly on, or the fluid is low, or the brakes are failing It sounds like the fluid is getting low from normal brake wear and not a problem. Just get the front brakes cheched and replaced. Don't put any fluid in because the new brake pads which are thicker will take up the space the fluid has dropped and push the fluid back to the correct level

Your engine is shutting down at idle because of a a bad seal on the engine induction system. It is the big duct that connects to the engine air intake. Leave the car running at idle, E-Brake on, and squeeze the big black duct going from the air filter to the engine, Does the car shut off? Next check small little hoses that attache to this big air duct. Try moving them a little to see if the engine runs different.

If these are good then I would shut off engine and remove this duct. A hose clamp holds one end. A slotted srewdriver will work to remove this clamp. The other end, at the Air Filter simply unclamps by hand.

The Throttle Valve is the first thing you see in the engine, it is inside the intake just after the duct you removed between the Air Filter and Intake. Have some one open the Throttle by stepping on the gas pedal and see if it is clean around the edges. If not, use some cleanning alcohol from your medicne cabinet to clean this area. A toothbrush will get into the tight spaces. Wipe clean with paper towel. Autozones sells a special cleaner called Throttle Valve cleaner spray. Use this not Carburator Cleaner.

If it still runs bad a idle the idle valve could be dirty and now you need more tools to remove it and clean too.

May 27, 2009 | 1988 Daihatsu Charade

2 Answers

1996 Grand Am dies when i slow down


Try adjusting the idle and changing the fuel filter.

Apr 11, 2009 | 1996 Pontiac Grand Am

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