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1983 CJ5 6 cylinder lagging

Discussion in 'Jeep CJ' started by Freer, Dec 2, 2017.

  1. Dec 2, 2017 at 12:09 PM
    #1
    Freer

    Freer [OP] New Member

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    1983 CJ5 Renegade 6 cylinder
    Dual exhaust, solid rear axles, front locker, non smog carb.
    i changed the spark plug wires, including the wire to the distributor, the PCV valve, fuel filter, air cleaner element and am in the middle of changing the fuel pump, even though the fuel pressure is fine. After the above my Jeep lags when I speed up to 55 MPH or so to enter the freeway. It acts exactly like it has a governor on it and quits accelerating. It is still running but has no power. I removed the air cleaner and it still has the problem. It also has a replacement carb with no smog attachments. The carb was changed out years ago due to a vacuum leak in the original and has had no problems. Any advice?
     
  2. Dec 2, 2017 at 12:26 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Welcome aboard! I don't know much about carbs, so hopefully someone pops in with some help.
     
    JKBob 25 and Freer [OP] like this.
  3. Dec 2, 2017 at 6:41 PM
    #3
    JKBob 25

    JKBob 25 Well-Known Member

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    Welcome to the forum Freer.
    I would start with the jets. Clogged, need adjusting, are the first issues that come to mind. Lack of acceleration may not be a carb issue. No other mods done?
     
  4. Dec 2, 2017 at 7:31 PM
    #4
    Freer

    Freer [OP] New Member

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    1983 CJ5 Renegade 6 cylinder
    Dual exhaust, solid rear axles, front locker, non smog carb.
    Thank you. No other mods except metal valve cover.
     
  5. Dec 2, 2017 at 7:37 PM
    #5
    JKBob 25

    JKBob 25 Well-Known Member

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    Hmmm. :crazy:. Carb may not be the issue. But it does also sound like a leak some where. Manifold leak? Your sure carb is tuned? Don't mean to question your upgrades. Just grasping at issue that could be the problem.,
     
  6. Dec 2, 2017 at 8:52 PM
    #6
    aggrex

    aggrex Well-Known Member

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    Welcome! Since the mysterious problem appeared after making the above changes I would take a step backwards to eliminate some of the variables. Try using the old wires just to see if the new ones are suspect or arcing. All vacuum lines attached? Fuel filter or PCV valve installed correctly? Did you replace the plugs?
     
    JKBob 25 and chris4x4 like this.
  7. Dec 2, 2017 at 9:08 PM
    #7
    Freer

    Freer [OP] New Member

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    1983 CJ5 Renegade 6 cylinder
    Dual exhaust, solid rear axles, front locker, non smog carb.
    Yes, I replaced the plugs.
     
  8. Dec 3, 2017 at 7:01 PM
    #8
    JKBob 25

    JKBob 25 Well-Known Member

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    :jerkoff:. Hmmm. Any other carb knowledgeable members out there. We missing some thing?
     
  9. Dec 4, 2017 at 8:43 AM
    #9
    OFFGRID

    OFFGRID Well-Known Member

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    Was it fine before the changes? My thoughts are it sounds like you are not getting the vacuum advance on the distributor. Check your vacuum lines and make sure they are all good, no cracks, everything connected and connected to the right places.
     
    JKBob 25 likes this.
  10. Dec 5, 2017 at 6:10 PM
    #10
    Freer

    Freer [OP] New Member

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    1983 CJ5 Renegade 6 cylinder
    Dual exhaust, solid rear axles, front locker, non smog carb.
    It looks like it was the fuel pump. I’ll know more in a few days. Thanks for The replies.
     
    chris4x4 and JKBob 25 like this.
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