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Thread: carb pop back
          
   
   

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  1. #1
    trenchdog73's Avatar
    trenchdog73 is offline CHR Member Visit my Photo Gallery
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    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?

  2. #2
    thesals's Avatar
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    sounds like timing or valve adjustment... check timing first... if that doesn't solve it... pull the valve covers

  3. #3
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    Originally posted by thesals
    sounds like timing or valve adjustment... check timing first... if that doesn't solve it... pull the valve covers
    Yay verily

  4. #4
    trenchdog73's Avatar
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    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.

  5. #5
    vara4's Avatar
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    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 ~

  6. #6
    trenchdog73's Avatar
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    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?

  7. #7
    trenchdog73's Avatar
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    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.

  8. #8
    chevy383cid is offline CHR Member Visit my Photo Gallery
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    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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