My new motor keeps back fireing through the intake it does it under a load i have replaced every sensor on it and had it tuned I am stuck because I have nothing else to replace.thanks for any help
347 efi back fireing through intake
- Thread starter watchdogfour
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hotcobra03
Active Member
Valve train . Back fire is normally caused by wrong timing or a stuck valve .with engine just being built you might need to do a cyl leak down test .
hotcobra03
Active Member
Your dizzy is the other thought .you say misfire under load.maybe pull dizzy and ck gear on shaft and for internal pieces .
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ive tried two diffrent dis. i dont think its a stuck valve cause it does not do it all the time ive replaced o2s mass air coolant temp all new tune up tps fuel pump i dont know what the hell it is.
ive tried two diffrent dis. i dont think its a stuck valve cause it does not do it all the time ive replaced o2s mass air coolant temp all new tune up tps fuel pump i dont know what the hell it is.
hotcobra03
Active Member
Its hard when you have changed most parts.ive heard a map can do that but you dont have that type .are thier anycodes at all.if it was me i start with basic compression ck and leave gauge on each cyl .while doing so ck plugs and wires.a back starts from inside engine and seems ignition related . Weak spark or interrmitted spark.
