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Re: Backfire through tbi
Did this start when you installed the motor, or is it a recent development?
Flat tappet or roller cam?
Tripple checked firing order?
How many miles since rebuild? (Could be a flat cam lobe)
What distributor and ignition system are you using?
What is your timing? Preferably base and total.
Checked for vacuum leaks?
I think you said, you are working on a 90 suburban???? Typo??
Not sure where the cut off is, but I know early to mid 90's gm Halifax dizzys would pop and backfire when the ignition module would start to go out.
Just spitballin'
-Russ
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