Question about 1989 Jeep Wrangler

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No smog I have a 89 jeep wrangler yj 4.2 liter. The smog guys say it is running too rich. What could possible be wrong?

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A bad sensior on the thottle body

Posted on Jul 26, 2009


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Have a 89 jeep with a 2.5 liter, keeps fouling out the plugs.


How is your o2 sensor? if it is bad it would make the car run rich and foul the plugs.

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One possible explanation for this is that the crankshaft position sensor is going bad.

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1 Answer

89 Jeep wrangler runs rich


check fuel pressure regulator and vaccuum going to it. likely it's allowing too much fuel in.

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1995 Jeep Wrangler YJ


a right angle pipe coming out from the top of the valve cover with a rubber hose attached. if you it out, shank it! it should sound like a mabble inside of it.

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