2004 Pontiac Grand Prix Trouble

[Chris1997]

Hello my name is Chris and I'm having some trouble with a used 2004 Pontiac grand prix and would like to see if anyone else has experienced these symptoms and how they fixed it. To start this all started happening after the cars engine bay got washed. Before replacing the cars battery, alternator, and cleaning the MAS the car would start very rough and soon die. Also the rpms were going haywire. After replacing these the car starts and runs fine initially. Rpms fluctuating way less than before. After driving it roughly 15 feet back in forth once and leaving it idle it soon dies after sounding like it's huffing and puffing towards the end. Interior lights and headlights fluctuate as well. Car also had carbon cleaner ran through it. Not sure on where to go next, any info is helpful. Thanks.

[Last Indian]

23 hours ago, Chris1997 said:

Hello my name is Chris and I'm having some trouble with a used 2004 Pontiac grand prix and would like to see if anyone else has experienced these symptoms and how they fixed it. To start this all started happening after the cars engine bay got washed. Before replacing the cars battery, alternator, and cleaning the MAS the car would start very rough and soon die. Also the rpms were going haywire. After replacing these the car starts and runs fine initially. Rpms fluctuating way less than before. After driving it roughly 15 feet back in forth once and leaving it idle it soon dies after sounding like it's huffing and puffing towards the end. Interior lights and headlights fluctuate as well. Car also had carbon cleaner ran through it. Not sure on where to go next, any info is helpful. Thanks.

Chris, if you haven’t pulled the IAC solenoid, that may be the issue. Under certain conditions this component can render a car inoperable. This solenoid gets carbon buildup & then it doesn’t seal in its port. Pull the solenoid out. Take some lacquer thinner in a small container. Using a small, 1/2” wide or an acid brush & placing the end of the solenoid in the thinner brush it clean. Wipe it off. Then take a rag, stick your pinky in the rag with some lacquer thinner on it. Stick this in the hole where the IAC goes & clean the port out. Repeat this till it comes out clean. See if this helps or makes a change & get back to us if it doesn’t.

Edited November 3, 2022 by Last Indian

[Chris1997]

Will try this and get back with you, thank you!