TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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Guys,
I've been hunting down a HUGE vacumm leak on the car in the signature. The leak is coming from the passenger side. I'm not sure if it is coming from the intake to head gasket or the injector o-rings or the runner gaskets. The engine has the intake off right now. We just replaced the intake gaskets last night(they looked FINE but replaced them for the hell of it). I have some new O-rings(16 of them). The gaskets for the runners and the rest of the superram setup looked ok. They didn't have any type of sealant on them though. I'm going to put sealant on the gaskets(sure hope they won't need to come off) and hopefully that will fix the problem.
Any ideas, guys??
Brendan
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1987 IROC-Z L98,SuperRam,EB 6085's,LPE 219/219 Roller, Crane 1.6RR, EB TPI Base, 58mm TB, ADS 24#, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, MSD 6AL, MSD Blaster 3, Aluminum DS, 94 Disk Rear, Adjustable Valve, Precision 3.73 Gears, Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,
Well i'm not exactly sure WHERE it is leaking. I thought it was the intake manifold. But when we got the intake off it looked fine, we replaced it anyways. It may have been the injector o-rings or the runners... i don't really know.
Hook up a regulater and hose to a small propane tank and spray around the gaskets and intake if you notice an increase in rpms that is were your leak is.
Did you put all the bolts in that hold the plenum to the runners? Like an idiot I put my superram in and left out a bolt because I couldn't get to it. You had to hear the whistle it made from the vacuum leak. Just thought I'd mention it-
UPDATE,
Well in the past two weeks me and dad and a friend have had the entire intake/superCRAP intake off. At first the intake bolts were loose so we tightened everything to spec. Then reassembled everything(dumb idea). That didnt' fix anything so we tore it down AGAIN. This time we took the intake off and replaced the gasket(which looked fine). Then we replaced all of the injector o-rings(which looked ok). We used the same superram gaskets but this time i put black rtv on ALL of them along with the superram lid(after putting a few new coils in the stripped out lip holes). Got the thing back together and diacom reads a steady 14.6-14.7A/F ratio now!, no more leaks. All is well.
