Thread: 1998 GTP will not idle cold and revs to 1500rpm by itself when warm.

If the check engine light is on, I would go to a auto parts store (ie. Advance) and have them scan the car for the codes. Write them down, post them back to us and we can really go from there.

Otherwise, it could be any number of things, vacuum leak, MAF, MAP, etc... BUT if you get the codes, we would know why the light is on, and be able to help you narrow it down alot easier.

fuel pump resistor. gtp's have a 2-speed fuel pump, and sometimes the resistor goes bad causing the pump to not go into high speed on startup.

this thread will set you straight. Fuel Pump Resistor Bypass '97-'00 GTP Tips and Maintenance - Car Questions, Answers, and Discussion

if you do the bypass and its still not starting right, you have a different problem.

Originally Posted by flyerboy101

PS, there was a medium amount of black residue on the engine side of the throttle body and the throttle plate and the mechanism for the idle air motor...

Glad you got it cleaned up and back to working well. Just so you know tho, it will get black again and buildup is *almost* always going to happen. The reason being the EGR system dumps exhaust gases full of carbon back into the intake just after the throttle body. The carbon gets everywhere inside and will build back up as long as the EGR is still hooked up. You will just have to keep an eye on it and clean it again if the problem re-occurs.
It will take a while to build up, usually a couple years, but it will happen again. Just so you know.

Again, glad you got it fixed!!!

Or you can get rid of the EGR and just clear the code. :P

You have to unbolt the EGR parts, block off the now existing hole in the intake manifold, and the exhaust manifold. Tune so its not throwing the codes for a missing EGR system, and your good.

Why do you want it gone?

If it is just because of the "carbon" deposits, you shouldn't worry, its not like people will be looking for carbon inside the motor lol. It helps clean out the exhaust and I think may provide a little better fuel efficiency. The only reason to really get rid of it, is if you get headers and don't need the EGR and plan to tune it out anyways for future modding... If it will stay stock and a DD, leave it alone and don't be so anal about black stuff inside your motor that you can't see anyways.

Bahaha wow. Ok, my appologies. Lets see if I can word this so your feelings don't get hurt?

Why do you want to remove something off your stock motor that will harm your emissions and reduce your MPGs???