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Unread 03-28-2010, 08:42 PM   #1
gadgetmanwalt
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2008 WK 
 
Join Date: Mar 2008
Location: Ellicott City, Maryland
Posts: 2
2008 Grand Cherrokee 4.7 spark plug change

I have a 2008 GC Larado 4.7 V8, and I wanted to know which plug do I replace at 30,000 mile according to the owners manual. I set of plugs get replaced at 30K and the other at 100K miles. Is it the top or the bottom plugs. and if any feadback on recommendation on the brand and model I should use? Thanks Gadgetmanwalt

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Unread 03-29-2010, 01:01 AM   #2
cmassey_2006
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2006 WK 
 
Join Date: Apr 2006
Location: Georgia
Posts: 515
Maybe this will help: Jeep Grand Cherokee WK - Spark plugs

According to the 2008 Owners Manual, page 446, the plugs on top (intake side) are standard grade and need replacing after 30K miles. The plugs on the bottom/side (exhaust side) are premium grade and only need changing after 102K miles.

There are 16 plugs total: 8 on top (intake) and 8 on bottom/side (exhaust).

It looks like the top plugs are Bosch Nickel Yttrium (0.040 gap) and the bottom plugs are Bosch Iridium (0.050 gap). I'd stick with those plugs since they're what your Jeep came with from the factory. Torque specs for all plugs is 20 ft/lbs (be careful not to overtighten).
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Unread 04-01-2010, 12:41 PM   #3
gadgetmanwalt
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2008 WK 
 
Join Date: Mar 2008
Location: Ellicott City, Maryland
Posts: 2
Thanks for your help gadgetmanwalt
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