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01-30-2013
I am having a problem with my 2001 gtp. I have replaced plugs and wires, coil packs, ignition control modual, and catylitic converter and my car still has very little power. it starts and idles fine but when I hit the gas it starts to miss very bad. The code is a 300 random multiple missfire. If anyone has any tips, please let me know.
AJ
01-30-2013
Andrew...when I welcomed you earlier..i didn't see you posting this quick. Well..bummer that it's not running good.
Let's start off with teh basics. Year, model, any mods ?
01-30-2013
It is a 2001 grand prix Gtp with no mods. Any suggestions would be great.
Thank you
01-30-2013
What brand plugs and wires? Spark plug gap?
What brand ICM did you buy?
Maybe its possilbe the new ICM is fauilty too.
01-31-2013
I just had the same problem on a 99 gtp i just bought. what you have change are the most common problems.
but the other common problems are the lower intake gasket, supercharger gasket, throttle boby gasket. you can check thoughs with a can for carb or brake cleaner. with the car running spray around the base of the gaskets to see if the races or stumbles. it could also be the throttle positioning sensor, if you replace that it does need to be recalibrated. I am will to bet it is one of the gaskets though, I ended up changing all 3 on mine. hope that help.
01-31-2013
Bosch plugs and wires not sure what brand ICM I am going to test it tomorrow and let you know.
01-31-2013
Crizzo,
Thanks for your suggestions, I have already sprayed for leaks once, but I am going to do it again tomorrow and I will let you know what I find.
01-31-2013
You from fridley MN?
And those bosch plugs are some of the worst for our motors. You can only run Iridium and copper core plugs in our motors.
So if you plan to keep it stock, get some iridium plugs.
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