Proper vacuum at idle on a 1998 Tahoe 5.7L

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Feb 3, 2006 | 07:33 PM
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What should the vacuum be at idle on a 1998 Chevy Tahoe 5.7L Vortec?
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Feb 4, 2006 | 08:34 AM
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Anybody know. Trying to chase a possible vacuum leak.
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Feb 4, 2006 | 10:13 AM
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With all accessories turned off and the engine up to temp it's about 18"hg.

This changes with coolant temperature and load. The more load the less vacuum.
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