Question about 2002 Jeep Liberty

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Why is my 2002 jeep liberty 3.7 running rough. Replaced catalytic converters, replaced #2 and #4 fuel injectors all due to codes pulled. still, have to give gas for vehicle to idle. New codes are 112

Backfired through motor before replacing cat's.

Posted by Anonymous on


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  • Jeep Master
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Backfiring is an indication of incorrect spark firing order or timing check that the HT leads are not touching each other and that the firing order is correct

Posted on Jul 19, 2014


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Posted on Jan 02, 2017


Alexander Mimun

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SOURCE: 2002 Jeep Liberty Sport 3.7L

We have an 02 Liberty 3.7L, here at my repair shop, after customer replaced, spark plug's and all coil pack's, brought it here to my shop, was running with two cylinder's miss, did cylinder compression test, no compression on two cylinder's, remove valve cover's, found two rocker arm's off, remove cylinder head's, and found that on those two cylinder's the valve seat's had drop, keeping the valve open, and that's why the two rocker arm's had come off, do a cylinder compression test, could be the same thing, hope this was very helpful.

Posted on Aug 30, 2010

larry warren

  • 318 Answers

SOURCE: would the catalytic converter cause jeep to idle low?

Not likly but possible. Cat Converters usually only play up after some contamination causes blockage and usually only affects high rev range

Posted on Nov 28, 2012

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