Question about 2003 Jeep Wrangler

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Power loss + squeal @ 4500~ rpm

2003 Jeep TJ/Wrangler. 4.0L I6. At around 4000-4500 RPM, I get a sudden power loss along with a high pitched squeal, that sounds like a tea kettle going off, or a tire deflating.

Belts seem fine, no vacuum leaks (though at that high of an RPM it would be odd). Happens in neutral or in gear.

I get no engine codes. Vacuum pressure seems fine. Oil level is good. No idling issues, no fuel issues. It's not burning anything.

I was thinking maybe a clogged catalytic converter ? Though again the sound seems to be coming from the engine bay. Don't think I have any exhaust leaks either.

A friend had mentioned to me that the jeep does feel sluggish lately.

Sounds very similar to http://www.fixya.com/postquestion.aspx?trysame=1&thid=2338920&prdid=693384&ctgid=0&msgid=5875251&ref=spb .

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  • mark659 Jun 27, 2009

    Took out an O2 sensor before the cat to create a hole. No luck. Still hear the squeal and feel the power loss.

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Sounds like the mass air flow sensor to me.

Posted on Aug 17, 2009

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  • Jeep Master
  • 6,982 Answers

Could be the cat, They can make some pretty strange noises...Disconnect it and take it for a short ride and see if rpm's are fine (with it removed you probably won't be able to hear the noise though)

Posted on Jun 24, 2009

  • Richard Scordino Jun 28, 2009

    Don't think you can push enough exhaust out of a half inch hole to make much difference...

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