Thread: backfire after shut down
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05-23-2007 11:09 AM #1
backfire after shut down
hey guys iv just gotten my 327 sbc running after replacing the heads, cam and carb. Iv tuned it by ear as best i can and i have it running pretty good. There is a off idle stumble, but other than that it runs great until i shut it down then about 1-2 secounds later a loud backfire. i believe it is through the exhaust although there is a white smoke in the carb. where should i start looking?
thanx john
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05-23-2007 12:37 PM #2
Sounds like the butterfly's in the carb are not going completely shut....Yesterday is history, tomorrow is a mystery, Live for Today!
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05-23-2007 12:57 PM #3
yup... check and see if you have your throttle screw adjusted open too much when you let off the throttle all the way the bottom butterflies should be shut, if they're not, then you're not even idleing on your idle circuit.... which means your timing is probably too far off as well, because you adjusted the throttle screw to get it to run with the timing you've got would be my guessjust because your car is faster, doesn't mean i cant outdrive you... give me a curvy mountain road and i'll beat you any day
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05-23-2007 01:03 PM #4
hmm i did adjust with the idle screw to make it run with the timming i had. damn your good ill go look at that thanx.Last edited by sbcfierogt; 05-23-2007 at 03:44 PM.
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05-23-2007 03:45 PM #5
ok so all the advise you guys gave me is working im just having trouble getting it to idle now, but im getting closer. i had to move my distributer a gear back becouse i ran out of room turning it and found milky oil so im off to take the top end apart just hoping it is a simple gasket.
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05-23-2007 05:13 PM #6
more than likely is.... check intake first before pulling heads.... intake gaskets are more likely the point of failure.... and yeah, you'll have to get that timing retarded a little, its probably advanced a bit since you had it in your off idle circuitjust because your car is faster, doesn't mean i cant outdrive you... give me a curvy mountain road and i'll beat you any day
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