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Old 12-22-2019, 04:29 AM   #2
Greasey Harley
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Join Date: May 2013
Location: Post Falls, ID
Posts: 638
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'
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