That is really good advice!!
Order the plug type that is supposed to go to your Jeep! This is important!
If you go to a plug for a different vehicle, it may be too big or too small, or have the wrong sealing shoulder, or stick too far into the combustion chamber, ect, ect...
Use what ever brand name you are comfortable with.
If your plugs look fouled after a few thousand miles, go to the plug store and tell the guy you want one heat range hotter plug set. (Repeat if necessary)
Open the gap to about 0.045", and use some Never Seize on the threads.
Older engines have a tendency to need a little hotter plug as they get older.
Lost compression, deposits in the combustion chamber and leaking or weak rings may help foul plugs, and one or two heat ranges hotter plug may help relieve those symptoms.
If your plugs are chalk white, have burnt chunks out of the electrodes, have cracked porcelain around the center electrode, or have tiny purple, tan or black balls on them,
YOU HAVE A REAL LEAN OR DETONATION PROBLEM!
Have that looked into at once!
You are looking for a medium tan color on the center electrode porcelain.
About the color of caramel.
If the porcelain is white, TOO LEAN!
If the porcelain is black, too rich. (or too much oil in the combustion chamber from old oil rings)
If you show too lean or too rich at half throttle or wide open throttle, it's the main jetting.
If you show too lean or too rich from idle up to about 1,000 RPM, it's the idle mixture.
If you have a slightly rich or lean condition, and you have a sealed carb, or have emissions testing, you can use cooler or hotter plugs to fine tune the combustion process.
This goes for fuel injection also....
Later folks, hope this helped! Aaron.
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