The torque specifications, for a 4.3 liter engine manifold, is 45 pounds per square inch. Torque the manifold bolts in 15 pound intervals.
the diffence is the intake manifold and exhaust manifolds are slitly bigger
I would suspect the manifold itself is leaking around the cooling passages. It will need to be removed and the gasket replaced.
190hp
Trouble code P1537 means: Intake Manifold Runner Control Malfunction (Bank 1 Stuck Open) Trouble code P1538 means: Intake Manifold Runner Control Stuck Open (Bank 2)
The 88 engine is a TBI / Throttle Body injection engine. I don't know the month of 1996 when they changed to the vortec engine fuel system, But I believe it was in late 1996. You should know if the 1996 engine is a TBI engine or a vortec engine if you have Sean it. So if it is a TBI engine then you have no problems, Put it in there and hook everything up and your good to go. Now if it's a vortec engine you have problems, None of the wireing will hook up to the 88 engine sensors. And the 96 computer will not run the 88 engine. And the fuel pump in the 96 Tahoe has to much fuel pressure for a TBI engine. You can not put the vortec fuel system/ intake manifold on the 88 engine because none of the intake bolts will match the heads or vise verse. You will be opening a can of worms. You need to go back with a vortec engine if that is whats in the Tahoe now.
what exactly do you mean? there is a passage that runs along the bumper to the front of the car next to the hood latch... that's what the little cage thing is. that's whats under the air filter box that runs to the intake manifold.
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1-5-4-2-6-3-7-8 It should also be stamped on the intake manifold, same as all Ford engines.
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If your 1997 GMC 5.7L Vortec has a misfire at an idle but not while under throttle, the problem is likely the timing. This can be adjusted.
Well you might have a dirty fuel injector, low fuel pressure, or an air leak somewhere in you're intake manifold.