cobra reply
I can tell the car is running rich because you can smell the gas. The milage on the car has also suffered.
I took the car to 2 shops. One shop checked out my mass air and found out everything was fine on the mass air part. The guy designed the intake on the 2010 GT and has a very nice shop, so he knows his stuff. I bought a custon setup from him in which he tuned it for my car. None of this fixed my problem.
I changed the sparkplugs as well with the correct gap. Ive actually changed them 3 times.
I have also put the (cop) in diff places to see if the codes would follow and they didnt. The car actually spit out like 4 diff. codes.
The modifications include.
bbk x-pipe, aftermarket cop, bbk twin throttle body, cold air intake and not the cheap jdl kind, underdrive pulleys, flowmasters. Thats all of the engine mods
Also, are you the original owner of the car? What is the complete modification list for the car? Im not the original owner of the car, but the lady who had the car had not driven it in 3 years.
Does the car have a prior custom tune on it or has the factory ECU/computer been re-programmed ? Still have the stock 24lb fuel injectors or are they bigger sized ones (did previous owner run forced induction) ? injectors are stock- nothing has been reprogramed
FWIW - Swapping to an aftermarket midpipe does not "cause" the engine to run rich - common misconception. Your rear O2 sensors are only there to monitor for the presence of a voltage change (via electronic signal) in the exhaust stream between the front O2 sensors and the rear O2s IIRC.
If catalytic converters are not present, the rear O2s will simply "see" a difference in the electronic signal (via voltage) and trigger a check engine light. The rear O2s are simply a monitoring function.
Now, your front O2 sensors DO communicate with the car's computer/ECU to affect drivability, etc.
Double check everything and get the codes read again and/or try another shop for a 2nd opinion. Most auto parts stores (Autozone, etc) will read check engine/MIL codes for free as well...g'luck ![/QUOTE] The code that comes back now says that its in a intake/exhaust pressure- the guy said that usually meant o2 sensor bad