LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Symptoms of a vaccum leak??

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Old 10-09-2003, 08:58 PM
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Symptoms of a vaccum leak??

Just as the subject says. What are the most common symptoms of an vaccum leak?? I recently has a cam installed on my car, and now I think I have a vaccum leak. I have a hissing sound coming from the engine. I don't think it's an exhaust leak either. Any help would be great.

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Old 10-09-2003, 09:02 PM
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rough idle.
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Old 10-09-2003, 09:08 PM
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I have a pretty loopy cam, so it's kind of hard to tell.
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Old 10-09-2003, 10:24 PM
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It can cause increased idle (if not a severe leak) and definitely lower than your normal IAC counts will be seen. The pcm will try to compensate for the leak.
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