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Old July 8th, 2013, 08:08 AM   #1
Silver Bullet
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Default Spark Plugs- 04 Grand Cherokee 4.7L H.O.

So I changed the plugs in my Jeep this weekend. Champion plugs are hard to find. only Orielys and Napa sell them. Napa gave me the wrong part (3318 which is for 4.7L non H.O.) so I was forced to go to Orielys because Napa was closed and get the correct ones (3340).

Reviews said the passanger side rear was kind of a pain and it was. All others were a breeze. You must take off the air intake to do this but thats also a breeze.....2 bolts on the sides.

General question. The plugs I pulled out were gapped at .045 (6) and .047 (2). The specs.formthis vehicle are .040. Would this be from improper gap upon install or wear/age of the plug?

Last edited by Silver Bullet; July 8th, 2013 at 08:21 AM.
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Old July 8th, 2013, 11:36 AM   #2
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Originally Posted by Silver Bullet View Post
So I changed the plugs in my Jeep this weekend. Champion plugs are hard to find. only Orielys and Napa sell them. Napa gave me the wrong part (3318 which is for 4.7L non H.O.) so I was forced to go to Orielys because Napa was closed and get the correct ones (3340).

Reviews said the passanger side rear was kind of a pain and it was. All others were a breeze. You must take off the air intake to do this but thats also a breeze.....2 bolts on the sides.

General question. The plugs I pulled out were gapped at .045 (6) and .047 (2). The specs.formthis vehicle are .040. Would this be from improper gap upon install or wear/age of the plug?
Autozone sells champion plugs. :\
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Old July 8th, 2013, 12:20 PM   #3
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I guess it would depend on how old the plugs are, they could get .05 off if it's a high mileage on them

If they are newer plugs then they were probably never gaped correctly before they were installed
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Old July 8th, 2013, 03:28 PM   #4
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Autozone sells champion plugs. :\
Not the locations in my area. I went to (in order) Advance Auto, Auto Zone, Napa, Orielys.
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Old July 8th, 2013, 03:57 PM   #5
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General question. The plugs I pulled out were gapped at .045 (6) and .047 (2). The specs.formthis vehicle are .040. Would this be from improper gap upon install or wear/age of the plug?

Does it matter?
You are replacing them.
Who cares if the old ones are .005 to.007" off?
Put the new ones in gapped properly and go.
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