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Black Trac 03-20-2011 08:28 PM

2008 Grand Cherokee 4.7L Gen II Spark Plugs
 
I will be attempting to change the upper 8 spark plugs at around 30K on a 2008 Gen II 4.7L Grand Cherokee Laredo.
  1. My plan is to use the OEM FR8TE2 spark plugs listed in the owner's manual. From my past experience, Chrysler uses Champion plugs but I think these are Bosch. Correct? Are these available?
  2. I looked at the engine and it looks like I need to remove the 2 plastic shroud/cover assemblies on top of the manifold so I can see the coil packs. At first look it appears the outer shroud, surrounding the inner cover, might just be clipped on because I can't seem to locate any visible bolts or screws going thru it. I expect after I remove the outer shroud I will find screws or bolts holding the inner cover that has the "4.7L" wording on it. Maybe I just need to remove the outer shroud to clear the coil packs?
Can someone having experience working on this engine offer suggestions/help? The only help I can find show the 4.7L Gen I engine and the top covers appear quite different.
Thanks

Scottina06 03-20-2011 08:45 PM

Re: 2008 Grand Cherokee 4.7L Gen II Spark Plugs
 
The upper plugs are bosch nickel and the lower plugs are bosch irirdium. You can get them at the dealer.

You dont need to remove the intake resonator(the shroud with 4.7 on it) to access the coil packs. Each pack is held on by one bolt.

Black Trac 03-20-2011 09:00 PM

Re: 2008 Grand Cherokee 4.7L Gen II Spark Plugs
 
Thanks. How do I remove the outer shroud? Anything else under there after that? Looks like maybe the Air Tube from the Air Filter needs to be removed?

Scottina06 03-20-2011 09:13 PM

Re: 2008 Grand Cherokee 4.7L Gen II Spark Plugs
 
remove the air tube by looosening the t clamps and then unscrew the t clamp on the TB and pull the shroud up

Milous 03-20-2011 09:36 PM

Re: 2008 Grand Cherokee 4.7L Gen II Spark Plugs
 
A few more tips:

http://www.wkjeeps.com/wk_sparkplugs.htm

Black Trac 03-20-2011 10:53 PM

Re: 2008 Grand Cherokee 4.7L Gen II Spark Plugs
 
So that outer shroud is just clipped in?
All I do is, "remove the air tube by looosening the t clamps and then unscrew the t clamp on the TB and pull the shroud up" and it should come away free?

moparBG 03-21-2011 10:46 PM

Re: 2008 Grand Cherokee 4.7L Gen II Spark Plugs
 
Quote:

Originally Posted by Black Trac (Post 379692)
So that outer shroud is just clipped in?
All I do is, "remove the air tube by looosening the t clamps and then unscrew the t clamp on the TB and pull the shroud up" and it should come away free?


Yes, it does just pull off. There are rubber fittings holding it together. Just pull up wiggling side to side at the same time. There are two covers. The first is a decrative cover and the second is the air plenum. All just pull off (seperately).

moparBG 03-21-2011 10:49 PM

Re: 2008 Grand Cherokee 4.7L Gen II Spark Plugs
 
BTW, if you didnt pick up the plugs yet from the dealer, be prepaired for some sticker shock. when your dealing with 16 plugs, it gets pricey quick. They set me back $88 for all of them from my local dealer.

Black Trac 03-22-2011 08:51 AM

Re: 2008 Grand Cherokee 4.7L Gen II Spark Plugs
 
This is for the 30K change so I was only planning to do the uppers. The service period for the lowers is 100K. Can they go that long?

The Upper Bank plug in the Owner's Manual lists FR8TE2. I think they are Bosch plugs. Are the Bosch FR8TE2 plugs dealer only? I do want to stick with OEM.

Thanks everyone for help with directions for removal of shroud and plenum cover.

moparBG 03-22-2011 04:25 PM

Re: 2008 Grand Cherokee 4.7L Gen II Spark Plugs
 
Here are the part numbers I picked up. Have not installed them yet.


SPFR8TI332

SPFR8TE2AA

Black Trac 03-23-2011 07:01 PM

Re: 2008 Grand Cherokee 4.7L Gen II Spark Plugs
 
I see a lot of those doing this plug change suggest using dielectric grease on the plug/coil connection. I feel OK with that.
Others suggest anti-seeze on the plug threads. Maybe I'm old school but I was taught never to do that. Reason, reduced conductivity between the plug and block.
I'd appreciate any opinions and advice.

yllwjckt07 09-29-2011 08:07 AM

Re: 2008 Grand Cherokee 4.7L Gen II Spark Plugs
 
Do you need to gap the top plugs that come from the dealer, are they already gapped to the correct spec?


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