BACKFIRE ON DECEL

Chevrolet Blazer

Tiny

82blzrman

July, 6, 2007 AT 8:05 AM

'82 Chevy K-blazer 350cid v8 4speed manual trans.
100k miles
Mods: headers/duel exhaust/MSD ignition/edelbrock intake-nonEGR
Problem: idles fine, accels fine, backfire when decel in gear

FOUND 1188 RELATED QUESTIONS

1 Answer

Tiny

merlin2021

July, 6, 2007 AT 3:48 PM

2 things will cuase it. 1.) Vacuum or mechanical advance not working.
2.) If you still have converters with air tubes and check valve on the manifild, one of the check valvles is NG, air tube has holes.

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