Which NGK spark plug.... ??
05-13-2016, 12:01 PM
#1
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Year: 2001
Model: Grand Cherokee
Engine: 4.0
Which NGK spark plug.... ??
Which NGK Iridium spark plug would be the best for my 2001 Jeep Grand Cherokee with the 4.0 enigine?
RIZ
RIZ
05-13-2016, 02:52 PM
#2
Old fart with a wrench
I'm running ZFR5Ns in my 2000. No fouling or misfires with 192K on the engine.
05-14-2016, 10:18 AM
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Year: 2001
Model: Grand Cherokee
Engine: 4.0
Awesome! ZFR5Ns are the ones I was looking at.... thanks for the info. I pulled the coil pack off and removed all 6 plugs, going to replace them with the NGKs and go from there. .... do they come gapped correctly already? If not, what should I gap them all at? .035" ??? 038" ???
RIZ
RIZ
05-14-2016, 11:24 AM
#4
Old fart with a wrench
They are usually factory gapped for the application, but check them anyhow. 0.035 is the proper gap, but they could have been rough handled in shipping. I had a Champ with a cracked insulator that I didn't catch until it misfired.
05-14-2016, 11:26 AM
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Year: 2001
Model: Grand Cherokee
Engine: 4.0
wow, I'll check them over good. About to run out and get the plugs, spark plug gapper and anti seize. I'm hoping it isn't the coil pack but if it is, it's easy to fix.
RIZ
RIZ
05-14-2016, 11:35 AM
#6
Old fart with a wrench
You really don't need the antiseize. The threads are plated to prevent seizing.
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