Question about Pontiac Grand Prix

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My 2002 grand prix, is having a couple of problems. The biggest problem is it is stalling because of it idles irregular. It'll go high like to 3 or 4 X1000 Rpm, then die out. Sometimes it recovers and not stall but the rpm gauge will quit. Under the hood I hear air sounding like its escaping from the top of the engine, near the throttle body. Is there an easy way to determine the problem?... Im thinking new throttle body, or intake manifold?

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  • 473 Answers

L have had the same problem -solving it was the air flow sensor

Posted on Oct 14, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 225 Answers

SOURCE: engine idle incorrect nearly stalls runs on 3 cyl on low rpm

Best way is to get the fault codes read using a £15 interface cable and VAG-com software (£free) on a laptop computer. It will save you money. In the meantime, have you removed and examined the spark plugs?
Hope this helps you a bit. If it does, a "Fixya" rating would be much appreciated. If it doesn't
help you, I'd be grateful if you didn't bother with a rating at present - they can't be increased later if I do manage to solve your problem! Just come back and tell me what you found. Cheers, D

Posted on Dec 03, 2008

  • 1 Answer

SOURCE: 1995 pontiac bonneville stalls

I just went through lots of troubleshooting and expense on my 1996. Whenever I would lift my foot off the accelerator and was below about 30 mph, the rpm's would starts jumping around and sometimes it would stall. If I gave it a little gas (accelerator), I could sometimes keep it running. It also backfired once in a while. Starts right back up. Also, if I let it idle while in part, it would die after 1-2 minutes.

I ended up finding a hole in the fuel regulator. About a ~$70 part if you get an AC Delco, but very simple to change.

Posted on Dec 24, 2008

TLRogue
  • 99 Answers

SOURCE: 94 L reg clio 16v 1.8 tickover irregularities

Sounds like idle air control valve sticking. If i remember correctly, the idle air control valve is built into the throttle body. This is the part that connects between the air filter and inlet manifold. take this off and clean thoroughly with carb cleaner. if this does not work, then renew part.

TL

Posted on Jan 21, 2009

  • 14036 Answers

SOURCE: 2002 Pontiag Grand Prix GT 3.8 Runing rough and stalling at stops

sound like vacuum leak or fuel pump problems.scan it to see if egr valve sticking open.

Posted on May 14, 2009

  • 53 Answers

SOURCE: 2003 toyota sienna idle problem

After about 100K + miles the idle air control valve (IAC) begins to collect carbon deposits that interfere with the movement of the spring-loaded valve. You will not be able to clean this without removal and dissembly of the IAC body. Use an emory cloth or fine sandpaper to remove the build up around the valve. This should free it up to rotate without binding. This is a temporary fix, of course, and will either require cleaning again or replacement of the valve. Getting to the IAC requires removal of most of the intake upto, but not including, the intake manifold. Total time is approximately 3-4 hours, but worth it. Good luck, and I hope this helps.

Posted on Feb 21, 2010

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1 Answer

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Clean throttle body and idle speed control valve.
Re- learn the idle speed control valve.

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1 Answer

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I don 't know if I can solve it, but I had a very similar problem on a 2002 Grd Cherokee Laredo. It ended up being the Throttle Positioning Sensor (TPS). Unfortunately the part alone is about $125 and and total installed cost was about $250. It would idle high at first, then gradually work it self down to a normal idle. Once it was warmed up it it would have an up and down RPM during idling, and several times it stalled out at intersections. There was also a lot of transmission clunking going on when you put it in reverse or drive.
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1 Answer

Grand prix wont idle


There are 3 things that should be checked.
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Stalling issues


Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Dec 08, 2008 | 1995 Pontiac Grand Prix

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