Start up questions.

TYHOGG

Active member
What should be the millivolt reading on the o2 sensor at idle?
I'm getting 200+mv at start up but when it drops below 60mv the truck will almost die, but catches itself and stays running. Could this be a ground issue? I did change some wiring when i relocated the battery.

Does anyone know what timming i should be seeing in relation to tdc with 422 and vortec's at idle? I think i have seen 25* in other post just want to check.
 
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