Question about 2004 Jeep Grand Cherokee
I have replaced all 4 o2 sen. plugs twice and thermostat 3 times now in my o4 grand cherokee 4.0L it still comes back with he same old codes and after a while the eng wont get up to temp like it should i have also replaced the coolent temp sen. as well still had the same problem coming back again fans are not staying on . and back to the poor gas mil. front 3 plugs look good when i change them back 3 are bad. is it internal on the eng. or is the ecm bad ? LOOKING FOR HELP
If the codes are just not going away, they may need resetting so the ECU doesn't have them stored.
You may have a headgasket failure affecting those three adjacent cylinders. That motor doesn't seem to have a chronic problem with this but it can happen anyhow.
Keep an eye on the oil and water to see if there is any sign of contamination in either and check those three plugs for signs of rust or other non-carbon deposits. That 6-banger is one of the world's best engines and generally not a trouble-maker. We have 4 of them in the family of different eras, and all have been good to us.
Posted on Nov 08, 2008
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Posted on Jan 02, 2017
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