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Trouble with my Grand Prix

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91GrandPrix
New User

Sep 7, 2012, 5:09 PM

Post #1 of 2 (1689 views)
Trouble with my Grand Prix Sign In
Hey guys. I have a problem with my 91 Grand Prix GTP, 3.4 L V6. It starts fine, but when I'm driving and have to come to a stop, I have to keep my foot on the gas and brake. If I let off the gas and just brake then it dies. It has about 160 km. Brand new fuel pump, so that can be ruled out. I've been told by some friends that it may be a sensor, but they all follow that prediction with "not really sure which one though". I'd take it in to get it looked at but I don't currently have the time so I'm asking on here. Thanks in advance for your help.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 7, 2012, 5:42 PM

Post #2 of 2 (1665 views)
Re: Trouble with my Grand Prix Sign In
Quote
Brand new fuel pump, so that can be ruled out
First off, that statement is totally wrong. You can't rule out anything based on it's age. You test things during the failure and that is the only way you rule anything out, although I don't think this is a fuel pressure issue anyway.

You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.



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