alright got a weird one that is a intermittent problem(say once outta every 75 times I go 85+)

When driving around 60ish punch the gas car will drop into 2nd and once I get to about 5500rpm 92ish the service traction control light will flash along with the check engine light. I just turn the traction control on and off a few times and the check engine light clears.....The car has NEVER done this while in 1st gear and did it once while I was in a top speed run in 3rd gear at about 137-139ish at 5400rpm.(granted this time didn't worry about messing with the TC button)

Asked the dealer about this they said that they have no idea why the DIC would flash a service traction control light but that the check engine light is a misfire code. Of course because of the "conditions" at which the code was thrown they would not be able to diagnose the issue because the problem can't be duplicated under such "extreme" conditions...lawl.

The service adviser that says and I quote "our cars get hot around the shifter area because thats where the transmission is at".... couldn't be due to the fact that the cat is directly underneath it or the craptactular heat shielding job GM happen to do. None the less in all his wisdom his "guess" is that the misfire is cause by the high RPM's I'm running at the time causes exhaust back pressure to be so high is cause a misfire...sounds like a reasonable answer that is somewhat logical but coming from the man who thinks my transmission is under my shifter. I think that one of the techs told him that and he rattled the answer off to me.

I'm taking a random stab in the dark here that either I need to beef up the rest of my exhaust system to 3" piping with either no res or a free-flow res, or something is up with my cat and need to have it looked at further. Umm other than that I think I've included all the info I can think of related to this issue, any help/advice here would be awesome. One last thing I guess being that I'm quite new to the whole car tuning/performance world if it really is a misfire how serious is the issue/possible reasons???

Thanks in advance for the help and yes I know I'm retarded for driving at the speeds but blah...

 

Have you changed your plugs since break-in? They could be fouled causing a misfire code @ high RPMs. Have you cleaned your MAF and the air filter element? There could be something in there restricting airflow.

The stock exhaust is fine for top speed runs. I have 3" and have rockers/springs/pushrods/downpipe/shift kit/intake/HP tune/KDWIIs/NGK TR55 plugs/LS1 Plug wires/!Res/!cat/Bullet mufflers/3800P motor mount/TB/IAT and HSRK mods. There is no reason to step it up if yo are stock, you will loose some HP and SOTP feeling.

I would also have your tranny checked, there could be something jammed in there if the console is getting hot.

 

yes have iridium plugs in now

just cleaned out the MAF over the weekend, the K&N CAI filter only has 5Kish miles on it right now was looking at that while had the intake apart still pretty much spotless.

I still have stock exhaust except I've changed out the mufflers to magnaflows and have 3" tips runnin out from those

Console was getting hot because the dealership was to damn lazy to look under the car(when I noticed our cheap *** heat shielding around the exhaust) but there was a bunch of paper caught up in the heat shields, guess I ran over a trash bag or something I have no clue how it got there. After clearing out the trash most of the heat has gone away except when I run it hard still gets hot but thats expected. The main thing that brought my attention to the heat was that I had a CD in the little compartment in front of the shifter went to grab it and the damn thing was warped from how much heat was in the area. Took it to the dealer they blew me off and I looked under the car and walla.

I'll prob pull the plugs this comin up weekend check and see if they are fouled up any or not, hopefully that or the MAF that I just cleaned is the issue and won't run into it anymore. Thanks for the advice.

 

oddly enough thinking it's a faulty coil pack causing the misfire or possibly the spark plug wire not sure yet I'll have the dealer replace em both, hopefully they won't whine to much about it. Took the car back to dealer yesterday and they told me I've had 156 misfires on #5 none on the rest checked the plug today when got home this is what it looks like with 8k miles on the car.




: / hopefully just a faulty coil pack/spark plug wire easy fix