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no clue whats goin on

709 views 6 replies 6 participants last post by  Rob Keller 
#1 ·
Hey whats up guys i have a 1990 chevy half ton with a 350 its been backfiring through the throttle body so i figured it was the heads so i changed the heads on it. That didnt work so i changed the fuel filter and that took care of it for awhile but its started doin it again anyone think you can help me out.
 
#2 ·
Welcome to HOTRODDERS.com

Well what kind of back fire up thru the top are you having?

Is it one or multiple?

Did you check the timing chain?

Did you check the firing order?

Checked for bent /sticking valves?

I have seen the pick up coil go bad on those & it will act like a spun timing chain.

What brought you the decision to change out the heads?




R :thumbup:
 
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