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03-04-2010
i have a 2002 gtp no mods I am new to the web site an have found a ton of great info but now i am in a bind. I recently have changed my intake gaskets because of a light leak. Two week later my car is idling rough so i changed plugs wire and coils didn't change a thing so i took carb cleaner to check for vac leaks and nothing. I was wondering if anyone else had any ideas?
03-04-2010
Get it scanned and check Long Term Fuel Scans... try to find a local GTP member and ask them nicely to scan your car.
Also, any Service Engine Codes? If so, list them..
Odds are you have a vacuum leak.
03-04-2010
EGR maybe. It should be shut at idle, it could have failed open on you. I’m with Goose 100%, you need it scanned. Because it could be several items, especially since you didn’t give a whole lot of information. Anyway, checking out and cleaning the EGR is easy and free.
03-04-2010
no codes and i checked egr and it is still working great. do you think it maybe iac?
03-04-2010
The car runs smooth as can be at 1300rpm anything below that it gets ruff i just got it back yesterday from having brand new trans installed and he also told me he ran codes on the car an said i had a misfire and possible clogeed cat so thats when i did the plugs wire and coils. Could it maybe the cat?
03-04-2010
no, you more than likely have a vacuum leak. Look harder.
03-04-2010
It certainly could be your cat. If your car has over about 120k, that would be in my top 5 list.Originally Posted by 02gtpalder
To check it, drive around tonight get the engine heated up. Get on it a little, and then pull over in a dark area. Leave the car running, pop the hood and look at your exhaust piping before the cat (and the cat itself). If it is glowing, the cat is your problem.
03-04-2010
wouldn't a vac leak make the idle go up and my exhaust tone is kinda lump sounding almost like a little cam
03-04-2010
Does the exhaust smell like rotten eggs?
03-04-2010
no eggs smells like gas and my car just hit 140000
03-04-2010
Well, if it was my car I’d call up a local shop and have them weld in a universal cat. It is your cheapest option when replacing the cat.
03-04-2010
im a certified tig and mig welder so i think im going to just do a delete since we dont have emissions. and then go from there then thanks a bunch for your in put!
03-04-2010
I just thought of another cheap easy one, replace your PCV valve. It is a way out there chance like 1:1000, but its two bucks
Although I’m pretty sure your cat is the issue. I have seen dozens of people that refuse to believe that cats and O2 sensors don’t last forever.
PS deleteing it will give you a perma CEL
03-04-2010
i cant buy the little sensor to trick the o2 sensor off of zzp or dont those work
03-04-2010
Honestly, I’m not sure they work for 04+.
The only method I do know works is the PCM code delete.
I’d give it a 50/50 chance
03-06-2010
ok figured it out guys after putting it on my fathers scanner and drove it #6 was the only one not firing so did compression test it was good so i got to looking and the wires to the plug for injector were bare an breaking so i repaired that and runs great again thanks for everyones help!
03-07-2010
I’m glad you found it, just as we suggested in the very beginning you needed to do a scan. I’ll never understand why people are so reluctant to use such a good diagnostic tool.
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