exhaust manifold noise?
Thread Starter
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Member
Joined: Aug 2001
Posts: 57
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From: Charlottesville, VA
exhaust manifold noise?
Guys:
I have had a problem recently develop: I have a noise that sounds like rushing air coming from my engine compartment. It sounds like it's coming from the exhaust mainfold, though I can't be sure. It only happens while the engine is cold. It happens mostly after I let off the gas (i.e. while I'm shifting). Does anybody have any experience with this kind of noise? What could it be? I'm hoping just an exhaust leak somewhere as I'm getting ready to replace the exhaust system. Can my heads suffer damage if I don't fix this problem soon?
Other info that may or may not help: Truck is a '95 302 5spd w/97k miles. I'm getting 16.5 mpg highway with no overheating and no steam coming out of tailpipe, and no water in oil (paranoid about a cracked head). Heat sheild on Cat is not loose.
Any help is appreciated.
later
scott
I have had a problem recently develop: I have a noise that sounds like rushing air coming from my engine compartment. It sounds like it's coming from the exhaust mainfold, though I can't be sure. It only happens while the engine is cold. It happens mostly after I let off the gas (i.e. while I'm shifting). Does anybody have any experience with this kind of noise? What could it be? I'm hoping just an exhaust leak somewhere as I'm getting ready to replace the exhaust system. Can my heads suffer damage if I don't fix this problem soon?
Other info that may or may not help: Truck is a '95 302 5spd w/97k miles. I'm getting 16.5 mpg highway with no overheating and no steam coming out of tailpipe, and no water in oil (paranoid about a cracked head). Heat sheild on Cat is not loose.
Any help is appreciated.
later
scott
Junior Member
Joined: Jan 2002
Posts: 1
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there is an exhaust cross tube from the back of each head, attached to it is a valve, these rust out over time. It is possible that this could be your noise, also you may want to try cleaning your throttle body, I've heard many dirty t-bodies make an air rushing-whistling type noise
Thread Starter
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Member
Joined: Aug 2001
Posts: 57
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From: Charlottesville, VA
update
Thanks guys for your suggestions.
Checked out the noise again with a buddy. It actually seems to be coming from around the throttle body/intake manifold area. It's tough to tell exactly where since the engine noise drowns out the sucking noise. I don't see any steam coming out of the heads or exhaust manifolds and no noticable cracks. I'll just disassemble and clean the TB, as well as inspect the rubber hoses and **** that come into/out of that area (can you tell I know little about my TB?) as a first step and see where to go from there. I have no interest in replacing my heads/manifolds...
later
scott
Checked out the noise again with a buddy. It actually seems to be coming from around the throttle body/intake manifold area. It's tough to tell exactly where since the engine noise drowns out the sucking noise. I don't see any steam coming out of the heads or exhaust manifolds and no noticable cracks. I'll just disassemble and clean the TB, as well as inspect the rubber hoses and **** that come into/out of that area (can you tell I know little about my TB?) as a first step and see where to go from there. I have no interest in replacing my heads/manifolds...
later
scott