Backfire through throttle body. Timing problem?
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Senior User
Joined: Apr 2011
Posts: 168
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From: East Texas
Backfire through throttle body. Timing problem?
If I rev the motor to 3000+ and let it drop to 1000-1500 then rev again it pops really loud from around the TB. I know I have the timing set to 10*btdc, but the chain probably has 200k miles on it. Could that be the problem?
Laughing Gas
Joined: Oct 2010
Posts: 997
Likes: 2
From: Rock Valley, IA
If it backfires through the carb it means the timing is too retarded and the intake valve is still open when it fires. I would guess, that yes, the timing chain has too much slack and that is why you get this problem after you rev it like that. I would take the timing cover off and check the chain. Replacing the timing chain can be a PITA but better than a blown engine.
Junior User
Joined: Dec 2011
Posts: 92
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From: Brandywine, WV
I've had some of my junkercycles backfire through the carbs when the mix is too lean and I snap the throttle closed too fast. That was with CV carbs though, so no idea if it applies to these trucks or not....
(Indeed, I prolly oughtta keep my mouf shut about stuff I don't really know anything about, eh? :P )
(Indeed, I prolly oughtta keep my mouf shut about stuff I don't really know anything about, eh? :P )
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samtye
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
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Nov 2, 2007 02:30 PM
