Welcome to Club Hot Rod!  The premier site for everything to do with Hot Rod, Customs, Low Riders, Rat Rods, and more. 

  •  » Members from all over the US and the world!
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and hundreds of thousands of posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

 

Thread: carb pop back
          
   
   

Reply To Thread
Results 1 to 8 of 8
  1. #1
    trenchdog73's Avatar
    trenchdog73 is offline CHR Member Visit my Photo Gallery
    Join Date
    Jan 2005
    Location
    Chicago
    Car Year, Make, Model: 1973 Chevy Nova
    Posts
    71

    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
    thesals is offline CHR Member Visit my Photo Gallery
    Join Date
    Feb 2004
    Location
    san diego
    Car Year, Make, Model: 66 mustangFB, 69 econline Drag Van
    Posts
    1,527

    sounds like timing or valve adjustment... check timing first... if that doesn't solve it... pull the valve covers

  3. #3
    urotu's Avatar
    urotu is offline CHR Member Visit my Photo Gallery
    Join Date
    Feb 2005
    Location
    Albuquerque
    Car Year, Make, Model: '77 Blazer, '64 Buick, '29 A Tudor
    Posts
    135

    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
    trenchdog73 is offline CHR Member Visit my Photo Gallery
    Join Date
    Jan 2005
    Location
    Chicago
    Car Year, Make, Model: 1973 Chevy Nova
    Posts
    71

    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
    vara4 is offline CHR Member Visit my Photo Gallery
    Join Date
    Dec 2003
    Location
    Pahrump
    Car Year, Make, Model: 1947 International Pick Up
    Posts
    3,179

    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
    trenchdog73 is offline CHR Member Visit my Photo Gallery
    Join Date
    Jan 2005
    Location
    Chicago
    Car Year, Make, Model: 1973 Chevy Nova
    Posts
    71

    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
    trenchdog73 is offline CHR Member Visit my Photo Gallery
    Join Date
    Jan 2005
    Location
    Chicago
    Car Year, Make, Model: 1973 Chevy Nova
    Posts
    71

    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
    Join Date
    Mar 2005
    Location
    hiawassee
    Car Year, Make, Model: many chevys
    Posts
    26

    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!

Reply To Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Links monetized by VigLink