Question about 1989 Jeep Wrangler

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Engine stalls occasionally even with new ignition system

My jeep wrangler engine started stalling when driving and sometimes at idle. I changed the plugs, oxygen sensor, distribuitor cap, rotor, and it was beautiful again. Two days after, the same problem and I also get a real strong smell of gas which led me to believe the problem was in the fuel mixture ratio. I checked everything again and the plugs and oxygen sensor were covered with a powdery black substance, but I noticed there was an unattached vacuum hose on the throttle body cover, and I can not find the other end of the hose. Could that be it? If anyone can provide me with information where to get a full vacuum diagram I would greatly appreciate it. My jeep is a 1988 wrangler 2.5 L engine

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  • hugosal2004 Jul 17, 2009

    I don't know. I don't have a scanner. If only I could get the vacuum diagram

  • hugosal2004 Jul 28, 2009

    Thanx pippall. I found two vacuum pipes that required air hoses, so I hooked it to one of those and the evil has gone except when going up a steep road and accelerating, it starts stalling againg, but not half as bad as it did so I lower the gas until the engine stabilizes and then gradually accelerate and it works fine. Thanks again. No wonder why you're a wizz. I am really grateful.

  • hugosal2004 Jul 28, 2009

    Just one more thing. The idle on my jeep is 950 RPM and when I have just returned from a 20-30 minute highway trip, the idle goes up to 1,500 RPM until the engine cools off eventhough it did not get hot at all during the trip. Do you have any idea what that could be?

  • hugosal2004 Jul 28, 2009

    ok. I'll do that

  • yadayada
    yadayada May 11, 2010

    well the codes are key if u have any, so get it tested.

  • yadayada
    yadayada May 11, 2010

    what trouble codes do you have?



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The powdery black substance tells me that your egr valve is not working.And that is operated by the vacum sysem.The pipe has probebly come of the EGR valve.

Posted on Jul 18, 2009

  • Philip Long
    Philip Long Jul 28, 2009

    the trotle air idle valve is sticking.Its placed on the inlet manifold.Remove it and clean with carb cleaner if that does not work replace it.Im certain thats your problem,Thanks for the feed back,Good luck.



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