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Posted on Feb 05, 2010

Miss and black tailpipe

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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  • Posted on Feb 05, 2010
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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>

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.
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