Question about 1991 Jeep Cherokee Limited

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Stumbles and miss fires

I washed the engine earlier and now it stumbles and miss fires i saw smoke from under neath and the exhaust pipe was red hot just after the cat so i cut the muffler off but it still stumbles and misses i looked at the wire conectors under the hood but none of the were wet in side and when it dies smoke comes out of the intake

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  • gilbertsonj_ Mar 06, 2009

    its acting fine now i guess water got into the intake through the valve cover breather the oil so bad reaction in the cat

  • gilbertsonj_ Mar 06, 2009

    wellits clean now so it wount need it again now for the engine in my truck its a 67 so dont have to worry about that just make sure no water down the carb

  • gilbertsonj_ Mar 07, 2009

    no my jeeps a 91 but i have a 67 chevy also that i have to rebuild the engine in ran low on oil burnt up some bearings so thats what im doing this summer

  • Richard Scordino May 11, 2010

    Cat may be plugged that makes the pipe hot. Or water got into something and is messing with either timing or fuel mixture NEVER wash engines. it will mess with everything & drive you crazy trying to figure out what!!!

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  • Jeep Master
  • 6,982 Answers

Or, more likely, whichever sensors got wet finally dried out. Like I said before NEVER wash engine!!!

Posted on Mar 06, 2009

  • Richard Scordino Mar 06, 2009

    67??? It'a listed as a 91!!! That makes a BIG difference!!! But, don't get alternator wet when cleaning...it will pop diodes (they get hot).
    Believe it or not, a little water sprayed down the carb (with hand spray bottle, not a hose...too much at once will cause hydrolock and bend connecting rods) is actually good for it ...it breaks up carbon on valves & pistons. Good luck with it!!


  • Richard Scordino Mar 07, 2009

    Used to build chev smallblock race engines (also Keith Black, Pink & Pisano, Hemi's for dragsters) 67 chev block is a good one (in truck, should be a 4 bolt main engine) If you have a forged crank, you have a really solid base to work from. If you killed some bearings, before you start, make sure you remove all welch (freeze) plugs and cam bearings, have the block boiled out to remove any bearing material & gunk from passageways. Have 'big ends" of rods checked to make sure they are still round. Then go ahead and rebuild. Prep costs a bit of $, but ensures that whatever you do, has a chance of actually working!!! Good luck with it!!!!!

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