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How to find a miss

Discussion in 'XJ Technical Chat' started by JBIII, Aug 28, 2008.

  1. JBIII

    JBIII New Member

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    My 650XJ has a miss at about 3000rpm I had the carbs rebuilt a year ago and it started about a month ago. Don't know if it is a fuel or an electrical problem. Any ideas where I should start?? :(
     
    JBIII, Aug 28, 2008
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  2. short_circutz

    short_circutz Active Member

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    Mine did something similar til I noticed that the exhaust pipes were loose at the head.....
     
    short_circutz, Aug 29, 2008
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  3. Zookie400

    Zookie400 Active Member

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    set the idle to 3000rpm and measure the temps of the headers, if one is cold, thats your missing cylinder. if its a random/intermittant miss, this method wont work.
     
    Zookie400, Aug 29, 2008
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  4. PaulT

    PaulT Member

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    I found a miss on Match.com, now she's my Mrs. ;-)
     
    PaulT, Aug 30, 2008
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  5. bluepotpie

    bluepotpie Member

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    I hope she's not an intermittent miss. ;-)
     
    bluepotpie, Aug 30, 2008
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  6. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    You can check two things first. Pull the plugs right after it misses like doing a plug chop. See what cylinder looks like the culprit. Check you plug wires and caps. You might want to ohm them out anyway. Check the connections in that cap. Try it again if it has a miss. You can pull the carbs and see if that carb has dirt in it. I found one of my plug wires had a bad connection at the cap. I cut the wire back and made a new connection and that was it. Good Luck
     
    MN-Maxims, Aug 30, 2008
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