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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > head gasket or exhaust problem????

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Unread 08-08-2009, 11:08 AM   #16
Registered User
1998 ZJ 
Join Date: Jan 2009
Location: Monroe, MI
Posts: 414
Originally Posted by jeep95xj View Post
Do you have a check engine light on? Most likely if your cat is bad the CEL will come on. If you dont then just get under your jeep and hit the cat with a closed fist. Sometimes when it's broken up inside it will rattle all around when you hit it.
No check engine light. Could I possibly have bad O2 sensors even though they are only a few months old?

Originally Posted by Double E View Post
Give it a kick or with a rubber mallet to see what may rattle around in there. You may have more than one issue however and I'm still suspicious of the cooling system.

"Im not losing an excessive amount of coolant but I did notice this black gunky stuff underneath my radiator cap and there was like little sparkle things floating on top of my coolant. I opened up my coolant reservoir and it looks a little brown around the edges."

Pull that reservoir and flush it out. Replace, Fill it, draw a line on it & monitor it.
Im gonna have to wait to at least tomorrow to anything since its been pouring outside all day. Ill update once its nice enough to do some work.

98 5.9 ZJ: 4.5" IRO + 1" spacers w/IRO front adjustable long arms and rear adjustable CAs, IRO OTK steering, KOR steering brace, JKS quick disconnects, IRO belly skid, Bilsteins, 33x12.5x15 Duratracs on MT sidebiters, ARB bumper w/ WARN M8000 and 2 55W Hella Black Magic, JCR stage 2 sliders, Bushwackers, AEM CAI, Kolak Ignition Upgrade, 3" Kolak exhaust w/Flowmaster 44

In the garage: 8.8 w/4.10s and LSD, Artec 8.8 swap kit and truss

My 5.9 BUILD THREAD: http://www.jeepforum.com/forum/f197/...hread-1095938/

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