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GT3 Vacuum Leak?


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Since my GT3 had the coolant lines pinned, I have had a recurring problem in that it throws a CEL for fuel trim when idling for more than a couple minutes.  I finally invested in a smoke tester and looking at the rubber intake connector on the right side (part #11 on the intake manifold parts diagram) and smoke pours out of the little nipple on the bottom.  I see that the same part is on the other side but I had no evidence of smoke from the left boot.  Is air supposed to come out (or enter when the engine is running)?  Thanks for any guidance you might have.  It is a royal PITA getting past the emissions test when the sensors aren't reset.

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I'm guessing it runs lean at idle?  Hopefully you found your vacuum leak, smoke testing it was a good idea.  Not immediately clear to me how doing the coolant lines could have caused this since you said it started after the pinning -- maybe coincidence.  The 996 GT3 and TT are pretty much bulletproof but the coolant lines are about the only thing that make me nervous.  At some of the tracks I raced at they actually won't allow these cars with the coolant lines stock and this flaw left unaddressed -- It can cause a disaster.


Texas may be easier but I bought a car from Dallas that was tuned and needed to take it off in the state I brought it back to.  You basically cannot get passed emissions until all readiness states are set and this can take 100 miles or more based on my experience with my car.  Playing games with the emissions vendors is a losing battle -- many states have outsourced it to a 3rd party vendor and they do thinks like match the checksum of your ECU and if it doesn't match, you're done and you're not passing no matter what your story is.  Same thing with the readiness states -- any of those is not "READY" and there's nothing to talk about, you're getting sent home with a FAIL.

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Thanks JFP.  I'm going to plug it with a stubby screw and a little sealant.  If it works I'm ordering a replacement.  It's cheap but doubtless a colossal pain to re-install.  prob loosen the engine mounts and drop it a couple inches to make room.


TT, yep, lean at idle.  runs great even on track.  I figured this occurred when they put the engine back together and re-installed it after pinning the pipes as it never happened prior to that repair job.  Fingers crossed I can get her inspected.  I am instructing at a track event next weekend.

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