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V-6 miss-fire

Discussion in 'Early CJ5 and CJ6 Tech' started by Ryan_25, May 29, 2008.

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  1. May 29, 2008
    Ryan_25

    Ryan_25 New Member

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    I rebuilt the 225 in the CJ-5. I get a miss fire on cylinder 2 and 4 when at idle. It stays there when driving and lacks power. The exhaust is not hot coming out of the right side of the engine. Cylinder 6 seems to be working fine. I have changed from the Pertronix to points and it remains the same. I bought a new distributor and same result. I tried timing changes, same result. New plugs and wires, same thing. I ordered a new cap and rotor and they have not arrived yet. Anybody have any ideas?
     
    Ryan_25, May 29, 2008
    #1
  2. May 29, 2008
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Did you start back at step one. Put cylinder 1 at top dead center. Line up the oil pump. Line up the distributor. Drop distributor in and put plug wire one on the cap where the rotor pointed.

    Sounds like the distributor is not oriented correctly. Remember, if you move plug wires, move them two terminals, not one.
     
    sparky, May 29, 2008
    #2
  3. May 29, 2008
    jayhawkclint

    jayhawkclint ΜΟΛΩΝ ΛΑΒΕ

    Oklahoma City, USA
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    Have you tried moving all your plug wires over one position on the cap?
     
    jayhawkclint, May 29, 2008
    #3
  4. May 29, 2008
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    LOL! Yeah. If it's incorrect now that might work too.

    I'm just thinking that you need to start back at step one on this one to be sure rather than create more confusion.

    DAMHIK.
     
    sparky, May 29, 2008
    #4
  5. May 29, 2008
    jayhawkclint

    jayhawkclint ΜΟΛΩΝ ΛΑΒΕ

    Oklahoma City, USA
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    x2!!! FTW.
     
    jayhawkclint, May 29, 2008
    #5
  6. May 30, 2008
    Ryan_25

    Ryan_25 New Member

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    I did that and I tried rotating the Pertronix
     
    Ryan_25, May 30, 2008
    #6
  7. May 30, 2008
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
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    Same crank as before?
    What cam did you install?
     
    lynn, May 30, 2008
    #7
  8. May 30, 2008
    Ryan_25

    Ryan_25 New Member

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    Compression is good on all cylinders. Same crank and the cam is for a odd fire motor. Cylinders 1,3,5 work perfect 6 works good and the only problem is 2 and 4.

    It is a strange problem and everything tests fine. Cap and rotor will be here today (I hope) and I will see if that fixes it.

    Thanks for the ideas, keep them coming.
     
    Ryan_25, May 30, 2008
    #8
  9. May 30, 2008
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
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    have you checked plugs 2 and 4 by swapping them with 1 and 3? or have you checked with a plug tester?
     
    66cj5, May 30, 2008
    #9
  10. May 30, 2008
    Ryan_25

    Ryan_25 New Member

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    plugs have been replaced many many times
     
    Ryan_25, May 30, 2008
    #10
  11. May 30, 2008
    Ryan_25

    Ryan_25 New Member

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    Its frustrating because everything I try produces the same result.

    I have read that there are different caps and rotors for the Delco distributor. Anyone know of this?
     
    Ryan_25, May 30, 2008
    #11
  12. May 31, 2008
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
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    Have you checked for vacuum leak at front of intake (2-4) and observe good rocker movement?
     
    Walt Couch, May 31, 2008
    #12
  13. May 31, 2008
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
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    Yup. Don't have the parts numbers off hand, but my '67 uses the cap listed in the Standard catalog as "marine and other" applications....
     
    Patrick, May 31, 2008
    #13
  14. May 31, 2008
    Dan66cj5

    Dan66cj5 Member

    Oregon
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    Just throwing out ideas.. did you rebuild the heads ? check for no sunken valves ? If not, or unsure.. you could do a compression check. Cylinders will not fire, if there is no compression.
     
    Dan66cj5, May 31, 2008
    #14
  15. May 31, 2008
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    See above

    I'm about 99% convinced that this is an ignition issue. Have you checked the spark on #2 & #4 plugs?
     
    w3srl, May 31, 2008
    #15
  16. May 31, 2008
    zed

    zed Iowa- Gateway to Nebraska

    central iowa
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    Just about to suggest that. Make sure the spark it at least there on those two cyls. I agree that it sounds like an ignition problem since there's now backfiring or misfiring.

    Unless for some odd reason those two cyls are not getting ANY fuel i.e. the intake valves are not opening at all, etc.

    checking ignition first as suggest by others is a simpler first step.
     
    zed, May 31, 2008
    #16
  17. May 31, 2008
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    If those cyls are not firing - the plugs should be wet if you pull them quick... That would mean fire is missing.
     
    Warloch, May 31, 2008
    #17
  18. May 31, 2008
    Patrick

    Patrick Super Moderator Staff Member

    Los Alamos, NM
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    If that were the case, there'd be no compression....
     
    Patrick, May 31, 2008
    #18
  19. May 31, 2008
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    At the risk of suggesting something really obvious, have you tried putting the engine at TDC on the compression stroke and then verifying that the rotor points to #1 plug wire? Once that is certain, double-check the firing order AND that you have the wires on the cap in the CORRECT rotation direction.
     
    w3srl, May 31, 2008
    #19
  20. May 31, 2008
    Ryan_25

    Ryan_25 New Member

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    I have checked everything that has been mentioned.

    I was sure it was an ignition problem until I changed everything ignition related and it continues to be the same.

    I think it is a carb problem now. The factory manifold is split down the middle. So one barrel of the carb feeds each side of the motor. After messing with the carb for a couple hours today I did get it running better.

    I would like to get a new carb for it. Does anyone know where I can get one? The tag number is 7026086 If anyone knows where might have one I sure would appreciate it.
     
    Ryan_25, May 31, 2008
    #20
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