-
Hey everybody looking for some help. Today I pulled off the intake plenum so I could replace a broken pintle cap on one of my injectors and also replace the injector seals, also put in new spark plugs. But after putting it all back together I developed a problem with keeping it running. It'll start up and thenit begins to stumble really hard and I'll hear a hissing noise from around the throttle body area, and when I give it some gas I'll begin to hear a popping noise coming from I think the Intake manifold. I've looked under the hood and don't see any vacumm lines off nor do I see/smell and gas leaking. The only thing I can think about is that I have a leaky gasket between the plenum and the lower manifold.
Any ideas?Bah-chicka-wow-wow -
If it is hissing that badly, take some starting fluid and spray it around the seal between the upper and lower plenum and see if the idle changes. If so, leaking gasket. Take a screwdriver to each injector to feel if they are all pulsing since you worked on them. -
I've been hearing a slight hiss in that region near my throttle body too… I'm not sure if I used a paper or a metal gasket for the plenum gasket…
which did you use? -
I reused my metal one. Cause everything that I had read said that you could reuse metal ones as long as they wheren't damaged.Bah-chicka-wow-wow -
Did you ever sand or scuff the mating surface of the plenum or the lower intake manifold?
I resurfaced mine with a surfacing disc… but at this point I'm not sure if it was done well enough. It may be rounded out a bit at the edges, but it looked smooth… I'll have to re-torque the bolts to see if they're OK..
Have you tried checking the bolt torque? -
Yep cleaned off the matting surfaces and tightened the bolts with a torque wrench like the FSM says.Bah-chicka-wow-wow -
same. I used a paint stripping sponge that I used on everything else, so I don't know if it's leaking from there.
Does the throttle body seal leak under boost? I got a Stanza TB and It was one of the only things that I actually changed, mechanically, during my vg30 repair that also developed the whistle.... -
No the TB seal doesn't leak. I'm just going to replace the plenum gasket cause it's a $5 repair and I'm almost 100% sure that that's where the leak is from.Bah-chicka-wow-wow -
Well it turned out to be the plenum gasket. Replaced it with a new gasket for a 2000 Xterra and it runs like a top now, just need to tighten up a couple of the intake clamps.Bah-chicka-wow-wow -
intake manifold gaskets these days..pff. LOL- VG30DET (HE341) 86 300ZX - 1982 280ZX Turbo - Headered NA 1986 300ZX 2+2 - 2000 Xterra - -
No, it is not ok to reuse the metal gaskets. The sealing ring compresses when you torque the plenum down.Bolt on, fast, z31. You can only pick two.
Old weaksauce numbers: 391hp/433tq
Copyright © 2006–. All rights reserved. Privacy Policy