Question about 1997 Jeep Tj

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I have an 06 jeep rubicon 4.0litre...when i drive at highway speeds the exhaust manifold turn red???why

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Either the cat is plugged or the timing is way retarded. since timing is non adjustable, I'd go for cat!!!

Posted on Feb 25, 2009

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I am assuming that you have no issues with the engine whatsoever, then the only possible areas to check would be:
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