Question about 1989 Jeep Wrangler

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Have a '89 jeep wrangler 4 cyl. manual.trans. it misses bad until up to about 50. also can see black soot on ground under tailpipe. any ideas>

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  • Jeep Master
  • 6,982 Answers

Your problem is fuel related. There is too much fuel entering the engine. If your vehicle has a carburetor, check the float level and needle valve for leaks.(also make sure the float actually floats...some develop leaks or foam type sometimes become saturated and sink) If injected, make sure that the throttle position sensor, map sensor and pressure regulator are working correctly and that the temperature sensor is also good.Last, check any vapor recovery system used...they sometimes can fill with fuel and allow raw fuel to re-enter the airstream and richen up the mixture. After finding the problem, replace the spark plugs as likely by now they are fouled.
As there are a number of items to look at, I can't give you an exact "fix" but if the vehicle was here, those aqre the items I'd look at first.
good luck

Posted on Feb 05, 2010

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Posted on Jan 02, 2017

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  • 11 Answers

SOURCE: miss and black tailpipe

bad fuel pump

Posted on Feb 05, 2010

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1 Answer

I have a 89 jeep wrangler with a 2.5 engine and ax-5 trans. it is knocking in all gears but 4th.


may want to do an oil change/filter on trans-then neccisary ajustments from a repair manual--if still persist then rebuild may be in order--trans can last 250 thou miles but heat is the killer

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1 Solution for 89 WRANGLER GETS HOT DIES/COOL THEN STARTS


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