I just put a ported tb on my2000 TA. Ever since I did this it revs up to 2000 rpm's when I push in the clutch. If sitting still it will eventually go down to idle @ 950 rpm's. I also descreened the maf when doing this. I was very careful not to touch the wires. The tb was ported by someone I found on this site, who has a good rep. Any ideas?

 

Car probably needs to be retuned. That's pretty common with porting a TB, MAF, or Intake. It shouldn't be that big of a deal.

Jon

 

it could be both, but im betting on it being your MAF. when you descreen it, you are adding more CFM to how much air flows through it. also without the screen, there is nothing to smooth out the air, so readings can be messed up. combine that with a ported TB, which adds even more CFM, you have a strange idle. if a tune doesnt fix it i would suggest you get a new MAF

 

i too am betting on the MAF but a good tune will help

 

Thanks for the info guys. I just shipped my pcm to frost today for a tune. Hopefully that will fix it.

 

For what it's worth, I installed a Shaner S3 on my car and got the exact same symptoms, only not quite so high of an idle. I tried resetting the IAC sensor, but no luck. As I have driven my car over the last couple of weeks, the idle seems to be settling down. Not sure if the computer is "learning" or what. MAF screen is still in place, BTW...

 

Did you ever get this resolved because I have the exact same problem but on an 04 GTO and I was thinking it could be the TPS?