intake backfire 1989 gmc 7.4 tbi
panicx
01-19-2004, 11:44 PM
My truck runs great untell it warms up.
Then ( seems intermentent )starts to backfire through the tbi.
Things i had tryed ,
plugs,wires,cap rotor,reman dist.
The only code i ever got was for the tps,replaced it with no change.
any ideas ?
Kelly
Then ( seems intermentent )starts to backfire through the tbi.
Things i had tryed ,
plugs,wires,cap rotor,reman dist.
The only code i ever got was for the tps,replaced it with no change.
any ideas ?
Kelly
herefordman
01-20-2004, 12:31 AM
Sounds like still a timing issue, distributor in right and timed right ? maybe a bad coil ?
panicx
01-20-2004, 08:35 PM
Well I did run the base timing up to 8 btc,calls for 4 btc.
But advancing it helped it not to backfire as much.
Set at 4 btc it will not hardly pull out of the driveway.
panicx
But advancing it helped it not to backfire as much.
Set at 4 btc it will not hardly pull out of the driveway.
panicx
herefordman
01-22-2004, 08:38 PM
Sounds to me like the distributor is worn out and moving around when it spins, missing the plug wire terminals occasionally when it fires.
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