Question about Jeep Cherokee

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Slight miss, starts a little hard then runs fine rough idle from time to time

1995 Jeep Cherokee 4.0 - Changed out the distributor with brand new (including sensor, rotor, cap, plugs and wires) prior to changing the jeep ran perfectly. Except the dist bearing was squeaking every now and then so I changed it. Now it starts up and runs but during start up every now and then it will turn over hard and have a rough idle. Happens more often when its cold. After it starts it runs just fine has plenty of power but will still have a slight miss at idle every now and then. Jeep has 80K miles.

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  • bigtruckmake May 10, 2009

    Completely replaced the distributor with new. Set the number #1 cylinder at 0 degress TDC. made sure the oil pump was at 11 o clock and the rotor was pointing at #1 on the cap when installed.

  • bigtruckmake May 12, 2009

    Driven it about 200 miles with no drastic change - starts worse when cold as compared to warmed up. Sometimes it starts right up with no issues and sometimes it has issues....
    Autolite plugs gap set to 33 no change.....

  • bigtruckmake May 18, 2009

    Tried moving the distributor back one tooth, forward one tooth and it ran worse in both positions. Put it back where it was and it will run best there but still bucks sometimes when starting and has a miss every now and then at idle speeds.

  • bigtruckmake May 19, 2009

    Well, I broke down and paid the dealer $100 to "check it out" ... What did they find? Nothing..... No codes.... Nothing.
    Well they thought it might be the starter and the miss "might" be a fuel filter/fuel pump - and for $900 they would replace all of it... The kicker is they couldn't guarantee it was any of those... Nice......
    I will pull the starter and clean it up - it is possible that is dragging from time to time since we do drive creek beds from time to time.....but the miss at idle?? Got nothing - I will replace the fuel filter to because......

  • bigtruckmake May 19, 2009

    That would have been the first thing I thought if all these issues hadn't shown up right after we changed out the distributor. When I am talking right after, I mean the first turn of the key after the replacement of the distributor.

  • Richard Scordino May 11, 2010

    Even though they show them going through mud, rivers etc, the engineers really don't do much in the way of protecting anything a lot. If you run off road a lot, start waterproofing stuff or you will continue to have strange problems.

  • Richard Scordino May 11, 2010

    Might be a bunch of BS, but have been told that this engine only likes champions. (so I run bosch in mine, with a modified chevy hei coil, gapped at 33. Also modified distributor and removed hold-down from it and use a chevy hold-down on it so I can change timing (don't tell the epa!)

  • Richard Scordino May 11, 2010

    On some of those, it may take some time for the computer to "re-learn" the new operating parameters of the cam sensor (in the distributor). Some require code clearing and re-programming with a scanner to get them to work correctly. I've also found that some plugs won't work in jeeps...has something to do with internal resistance... at the least, re-check gaps on them and maybe go a couple of thousandths under factory gap...(eg: go from 35 to 33 etc)

  • Steel Moore May 11, 2010

    Did you remove the distributor from the engine or just replaced the items you listed?



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It sounds like its out of time move the distriutor a little bit

Posted on May 15, 2009


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