12-08-2006, 11:17 PM
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#1
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AF Newbie
Join Date: Aug 2003
Posts: 2
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99 tahoe, hesitation, bank 1,2 lean misfire, map
I have a very bad hesitation when idle and surges really bad. the codes it throws is bank 1 and 2 lean, map sensor, misfire, and i dont know if it is at all contributed but it sounds like a bad vacume leak around the intake but im not sure, i read something about a plenum leak on these 5.7's
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12-09-2006, 08:45 AM
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#2
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A990 racer
Join Date: Mar 2002
Location: Chestertown, New York
Posts: 11,579
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Re: 99 tahoe, hesitation, bank 1,2 lean misfire, map
Welcome to AF. Low fuel pressure, clogged injectors, any air entering the engine unmetered, dirty maf, watch for K and N problems as they can contaminate the maf.
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12-09-2006, 10:26 AM
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#3
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AF Newbie
Join Date: Aug 2003
Posts: 2
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Re: 99 tahoe, hesitation, bank 1,2 lean misfire, map
Quote:
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Originally Posted by maxwedge
Welcome to AF. Low fuel pressure, clogged injectors, any air entering the engine unmetered, dirty maf, watch for K and N problems as they can contaminate the maf.
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is there any known problems with the intake or plenum gaskets on these leaking?
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12-09-2006, 01:31 PM
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#4
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A990 racer
Join Date: Mar 2002
Location: Chestertown, New York
Posts: 11,579
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Re: 99 tahoe, hesitation, bank 1,2 lean misfire, map
It is possible, discharge some propane around the upper intake, this would cause a change in engine reaction, just be careful, obviously
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