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Old 08-15-2020, 03:35 PM   #1
maroman88
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Join Date: Aug 2004
Location: Oradell
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Gen4 5.3 Misfire

2010 Tahoe 5.3
bought it with lifter tick, stuck lifter on 3.
Replaced Cam and Lifters with stock replacements along with all associated gaskets etc and it ran good
Out of the blue it started running like garbage, hooked up scanner and watched misfires on #3 with an occasional miss on 5, then 1 and 7 even less frequently.
Went digging, replaced intake gaskets and injector O-rings, swapped plugs, wires, coils, injectors, coil pack harness and MAF. Nothing has changed the misfire.
It idles rough, drives fine under normal load, after 3500rpm itll bog down, wont shift and ping like all hell from the driver side and #3 lights up with misfires. sometimes the traction and stabilitract messages will appear and power will pull until the truck is restarted again.
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