STILL not running right...HELP!

07arcticwhiteGT · 11-28-2010, 07:04 AM

Ok, so my car is still not running right. It started a while ago when I got the off-road x-pipe for my car. I then got the car tuned by brenspeed, and the car started running really rich and really rough. Turns out brenspeed tuned me for the wrong intake. The car was misfiring at idle (it does it worse when the motor is cold) and at low RPM's when accelerating. It was also burning through plugs in like 2 weeks. I put the old catted exhaust back on, and had Brenspeed send me a new tune for the catted exhaust and the right intake. The car ran a little better with the new tune. I then swapped the plugs for new ones, and the car ran amazing for like half a day. The next morning I started the car, and it was misfiring again. And it has been doing it ever since. It only has 38k miles on the car, so I am at a loss as to what can cause this. So any ideas what can cause an 07 GT with 38k miles to run like shit? I have heard that it could be anything from spark plugs to fuel filter to MAF sensor to fuel pump to coils. I have no idea why a car with 38k miles would already need those replaced, but any insight you guys could give me would be awesome. Thanks

david01130 · 11-28-2010, 12:13 PM

Its hard to tell. I would start by getting a code reader and seeing what kind of problems it is reading. Then I would look into getting it dyno tuned. I am surprised Brenspeed is having problems sending you the right tune. Usually they are pretty good with that. I have a tune from JDM and it has been great. A good dyno tune can dial your car in perfectly though. A good shop can read the codes for you as well. I do not think those code readers are that expensive.

07arcticwhiteGT · 11-28-2010, 12:19 PM

yeah i was thinking about taking it to the dealership and seeing if they could tell me exactly what was wrong with it. Ill also look and see how much I can get a code reader for. The weird part is that there is no CEL, so Ill have to see if it is throwing any codes

david01130 · 11-28-2010, 12:24 PM

It may throw a code without showing a CEL

david01130 · 12-06-2010, 07:18 PM

Did you ever get it running right?

07arcticwhiteGT · 04-26-2011, 01:15 AM

Sorry I haven't been on here in forever. I got it running right for a while, and then it started acting up again like 2 weeks ago. I parked it for now. The army decided to not pay me for the past 4 weeks, and they still haven't fixed it yet, so I have no more money to fix it right now. I am at a loss as to what it is, so once I get my back pay, its going to the shop and im not picking it up until they tell me whats wrong because I need to sell it and I can't sell it as it sits. Its driving me up the wall

david01130 · 04-26-2011, 11:24 PM

no check engine lights or anything? You may want to get a code reader and see what codes its throwing. Or just drop it off at a good shop.

07arcticwhiteGT · 04-26-2011, 11:40 PM

Na there is no CEL, and the code reader came up with nothing.

david01130 · 04-26-2011, 11:43 PM

Thats weird. Usually you will see some sort of code. Its probably in the tune. Sorry to hear that but that just sounds like a headache to me...

07arcticwhiteGT · 04-26-2011, 11:51 PM

It is..its killing me. Im on my second tune from brenspeed, my 4th set of spark plugs, im gettin really mad now haha