Underneath the intake manifold... - Saabnet.com Bulletin Board


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Underneath the intake manifold...
Posted by Steven Mitchem [Email] (more from Steven Mitchem) on Fri, 4 May 2018 12:16:25
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So I hook up compressed air and ran it through the turbo so I can find vacuum leaks ,what would be leaking underneath the intake manifold. The hoses that go to the air idle control valve are good no cracks no tears I was wondering can the air idle control valve itself have an internal leak that could escape to atmosphere.I had a couple of leaks around the turbo piping in a couple of clamps now I have isolated a leak underneath the intake manifold somewhere. There's no vacuum lines that go under there, the only hoses that are under there are to the air idle control valve unless I'm missing something. Could air be coming out of the fuel injector o rings the ones that go into the head. I took the ones out that came with the new fuel injectors because they seemed to have been getting gasoline on them somehow my guess is the O-rings weren't exactly the same size as what came on the Bosch injectors so I put some Bosch injector O-rings on it it seems to seal a lot better now. I have not hooked up the compressed air back to it since I put the new O-rings and it was late last night when I did it maybe that's where the air was coming from. One of the O-rings had a small tear in it so I'm guessing that's where the air was coming from. But is there any other place that there could be air coming from underneath there . I sprayed carburetor cleaner all around with the engine running trying to find the leak all the gaskets that go to the intake manifold to head are good and the throttle body to intake are good. And it almost seems like the air idle control valve is louder than I remember it being. This is a 1997. The car idles fine and the air fuel ratio gauge is exactly where it should be. But last night I got on it pretty good, and now when I give it gas the air fuel ratio goes way lean. Still idles fine and air fuel ratio gauge is still fine only goes way lean when I put my foot in it. And you don't have to give it very much gas at all before it starts going way lean so it's been parked since last night. Sorry for such a long post just trying to describe what's going on with the car. So if it's going away lean does that mean large vacuum leak or all of a sudden for some reason I have lost fuel. Brand new fuel pump fuel pressure regulator works, tested the fuel pressure last night it was 40. That was at idle.thanks

posted by 172.56.21...

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