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Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
All OEM related XJ specific tech. Examples, no start, general maintenance or anything that's stock.
In the picture below I have all 6 of my spark plugs taken out and removed, I have no idea how long they've been in my engine but they look pretty good. I myself has driven on them for 6000 miles. I have a 2000 Jeep Cherokee I6 4.0. I have suspicion of a cracked head because of coolant loss and a couple other things. What do you guys think?
Are my cylinders burning well? Too lean, too rich, just right?
Any signs of coolant or other contaminates?
Wrong brand. Supposed to be NGKs in a 2000..........
^^ Indeed. Go back in with NGK ZFR5N plugs. Gap .035".
The emissions placard on the firewall says (Champion) RC12ECC plugs and they do look like they are woprking okay, but the ZFR5N plugs are more suited to your waste spark ignition system.
^^ Indeed. Go back in with NGK ZFR5N plugs. Gap .035".
The emissions placard on the firewall says (Champion) RC12ECC plugs and they do look like they are woprking okay, but the ZFR5N plugs are more suited to your waste spark ignition system.
Would that be a big issue? Brand names? They fit and they're gaped to .035
People tend to insist on splitting hairs with XJ spark plugs. While the Champions do seem to be better for earlier XJ and NGK better in 00/01, this is some serious hair-splitting. If the Champs were fine, keep going; when it comes time to replace them, give the NGK's a try.
The stock plug preachers will probably have a fit hearing that I have iridium Autolite plugs gapped to 0.050" but the rest of my ignition system is suped-up, too; these plugs would be terrible in a stock XJ.
People tend to insist on splitting hairs with XJ spark plugs. While the Champions do seem to be better for earlier XJ and NGK better in 00/01, this is some serious hair-splitting. If the Champs were fine, keep going; when it comes time to replace them, give the NGK's a try.
The stock plug preachers will probably have a fit hearing that I have iridium Autolite plugs gapped to 0.050" but the rest of my ignition system is suped-up, too; these plugs would be terrible in a stock XJ.
My thoughts exactly. That's why I asked about the age/miles of the Chumpions.
12-14-2014, 11:43 PM
Rate My Spark Plugs
