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Surging while driving....

Discussion in 'Early CJ5 and CJ6 Tech' started by JhnBrackett, Oct 3, 2007.

  1. Oct 3, 2007
    JhnBrackett

    JhnBrackett Race Engimuneer

    Lakewood, CO
    Joined:
    Oct 17, 2002
    Messages:
    120
    *ANSWER* Read post #7

    Got the Jeep running again thanks to some members of the forum. Took it for a test drive yesterday, and oh boy did that not work. When the Jeep is underload above appx 30mph, it starts bucking/surging/backfiring. When I'm on flat sections it works just fine until 30 MPH, when there was an incline or I try to accelerate to quickly, it would start doing what I just described. Anyone ever had this problem? I've only had a stutter when the engine is cold and I try to accelerate in 2nd gear, never anything like this.
     
    Last edited: Jun 25, 2008
    JhnBrackett, Oct 3, 2007
    #1
  2. Oct 3, 2007
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
    Joined:
    Sep 10, 2003
    Messages:
    2,084
    almost sounds like a timing issue. what's the timing set at, along with the dwell?
     
    66cj5, Oct 3, 2007
    #2
  3. Oct 3, 2007
    mb82

    mb82 I feel great!

    Charlottesville Va
    Joined:
    Mar 17, 2003
    Messages:
    2,706
    Is a plug not firing? That is the same symptom my car had when I had lost one plug.
     
    mb82, Oct 3, 2007
    #3
  4. Oct 3, 2007
    junkfood

    junkfood Member

    Casa Grande,Az.
    Joined:
    Oct 23, 2005
    Messages:
    222
    That sounds like a vacuum advance problem. When it is under load it needs more advance to pull. Had an old D50 that did that, ran fine unless going up hill or accelerating. Cleaned the advance and plate and it solved the problem. But a vacuum leak would do the same thing.
    Keith
     
    junkfood, Oct 3, 2007
    #4
  5. Oct 4, 2007
    JhnBrackett

    JhnBrackett Race Engimuneer

    Lakewood, CO
    Joined:
    Oct 17, 2002
    Messages:
    120
    I'll do a check for vacuum leaks... that might actually be it. It was dark & I kept hearing a clicking sound from above the water pump area. I did regap the plugs to .28, could that be to little?
     
    JhnBrackett, Oct 4, 2007
    #5
  6. Oct 4, 2007
    TexColorado

    TexColorado Member

    Reno, NV
    Joined:
    Sep 13, 2005
    Messages:
    167
    My Jeep did something similar but hasn't done that lately with no repairs either. I did some checking on here and my symptoms at least lead me to believe it was related to a vacuum leak so you might want to start there.
     
    TexColorado, Oct 4, 2007
    #6
  7. Jun 25, 2008
    JhnBrackett

    JhnBrackett Race Engimuneer

    Lakewood, CO
    Joined:
    Oct 17, 2002
    Messages:
    120
    Just to help others out, the problem was incorrect float settings! Sadly, I just figured that out last night after so many months of working on it. The gas level was only 1/8-1/4" above the jets. I ended up replacing my Prestolite with an HEI distributor yesterday assuming that was the problem, sure wasn't, but the Jeep runs like a dream now. I highly recommend the HEI distributor to anyone, cost me $201 for everything NEW. Thanks to everyone for their input & help. I learned a lot about carbs (Fuel Injection guy) & the Jeep in general.
     
    JhnBrackett, Jun 25, 2008
    #7
  8. Jun 25, 2008
    kaiser_willys

    kaiser_willys Well-Known Member

    Joined:
    Jan 7, 2007
    Messages:
    1,524
    am glad to hear you found the problem:beer: i was gonna say check your fuel pump, a fuel pump that is starting to go bad will do the same
     
    kaiser_willys, Jun 25, 2008
    #8
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