Thread: carb pop back
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03-28-2005 06:14 PM #1
carb pop back
well my 350 runs fine except for when I mash on it, then about 40% of the time i get a loud pop through the carb then the car takes off. not sure what it could be. Im going to mess a bit with the timing see if that gets it but does anyone else have any thoughts on what it may be?
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03-28-2005 06:23 PM #2
sounds like timing or valve adjustment... check timing first... if that doesn't solve it... pull the valve covers
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03-28-2005 09:11 PM #3
Originally posted by thesals
sounds like timing or valve adjustment... check timing first... if that doesn't solve it... pull the valve covers
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03-29-2005 08:16 AM #4
I did switch over from points to hei about a year ago, it has a new cap and high out put coil(both with about a month and a half on them) with a msd 6al ignition. Ill check out the distributor shaft when I get off. slow acceleration is fine, It was a bit jerky below 2k but that stopped after a carb adjustment.
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03-29-2005 09:08 AM #5
Denny W ; Your right about the distributor shaft, People often over look them. I had that happen to me with a 73 VW bug, one cyclinder would load up with fuel then back fire up threw the carb.
The distributor shaft was worn out.
~ Vegas ~
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03-29-2005 10:41 AM #6
kool Thanks for the help ill run down the list when I get off this afternoon. Vara, was it a constant thing or somewhat like I discribed when ur shaft went bad?
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03-29-2005 05:59 PM #7
well I put a light on it and it would seem that the timing is at 0 at 1k with vacuum undone. Im going to have to redrop the distributor because it is fully advanced due to the advance it self manifold/carb so im hopin that is all my problem. I did a hot adjust on the vavles anyway. my distributor shaft feels alright but it was used when i put it in so im thinking i might replace anyway.
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03-30-2005 08:08 PM #8
you need more fuel, preasure or volume. do you see fire comming out of carb ? If you do, then adjust valves- intake opening- exh.closing, that is,- any cylinder that you choose to adj. turn crank until intake starts to open- stop adj. exh. valve, turn crank again until intake opens and is almost closed-stop and adj. exh. valve.this works for all types of cams!
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