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10-29-2008, 03:03 PM
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no clue whats goin on
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.
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10-29-2008, 03:17 PM
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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 
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"SlowRide66" "Illegitimis non carborundum" Don't let the bastards grind you down! Crankshaft Coalition Master List of Hotrodding Forums
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10-29-2008, 03:24 PM
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Kind of weird to change the heads right of the bat chasing backfire.
Just saying.. 
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10-29-2008, 04:24 PM
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lean mixture and/or retard timing. typically.
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10-29-2008, 05:08 PM
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Check the fuel pressure...you need at least 10psi with 12-13psi being ideal.
Most likely the pump is going south.
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11-02-2008, 12:33 AM
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Wow, that is like saying...."I felt vibration in the brake pedal so I swapped out the front axle..." not to rag on you but you blew way past where you need to be on that one.
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11-02-2008, 02:18 PM
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Well he said & I quote No clue whats going on.
& if he replies maybe we can help him out. R
__________________
"SlowRide66" "Illegitimis non carborundum" Don't let the bastards grind you down! Crankshaft Coalition Master List of Hotrodding Forums
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