jeep backfire through exhaust 5.9 -
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Go Back > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > jeep backfire through exhaust 5.9

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Unread 06-01-2013, 10:21 AM   #1
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1998 ZJ 
Join Date: Sep 2012
Location: Yankton, SD
Posts: 85
jeep backfire through exhaust 5.9

couple days i am driving down the interstate and i here my jeep backfire hmm strange so i get to my brothers house about a mile down the road and i see my jeep threw some codes po331 and po172 have searched and found a few different causes wanted to see if anyone here will confirm or deni the issues


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Unread 06-01-2013, 11:31 AM   #2
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1998 ZJ 
Join Date: Feb 2013
Location: Vienna, VA
Posts: 313
If it were on my car, I would test the knock sensor to see if it is indeed faulty (work on the p0331 code). It is possible that a faulty knock sensor caused some erratic behavior through the PCM, setting the p0172 code and the fire in the exhaust.
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