Possible vacuum leak - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-16-2006, 10:38 PM   #1
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Default Possible vacuum leak

At idle my boost meter does not bounce around but stays at a steady reading of about negative seven or eight. If I am cruising and back off the gas it will drop to negative ten, but when I come to a complete stop it will hover around -7 or -8. Is this a sign of a vacuum leak? It used to bounce around a little until the engine heated up and then settle down, but I first noticed this after I had my Flowmaster 80 series installed. I am having a Magnaflow highflow cat installed in the morning. Is this something I should be concerned about the moment?
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Old 04-16-2006, 10:44 PM   #2
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It'* possible. Though I'm no expert, a lot of SC owners have that issue with their boost gauge and have always thought it to be normal. I have a little movement in mine at idle, more so when cold, and I know of a place where I am leaking. I'd check your vac lines to be sure, and check your EGR pipe from the TB down.
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Old 04-17-2006, 10:14 AM   #3
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EDIT: Take OFF your EGR pipe, the one I was talking about, and check for holes in it. I found a hole in mine at the bottom. When putting it back on tighten it a little more than usual.
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Old 04-17-2006, 10:16 AM   #4
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Yes..I'd check the vacuum hoses and remember the ones below the airbox that go to the charcoal canister. With engine flex, those are common to get old and break
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Old 04-17-2006, 12:05 PM   #5
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K, will give it a look. I noticed today that the -7 to -8 reading is only when I am running my AC. Other than that it will set very close to -10 at idle.
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Old 04-17-2006, 12:21 PM   #6
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In that case...forget it..

perfectly normal.
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Old 04-17-2006, 09:07 PM   #7
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Alright, thanks once again guys.
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Old 04-18-2006, 10:25 AM   #8
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Anytime we can tell you not to worry and have another beer...just holler.
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