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Unread 03-08-2013, 05:18 PM   #1
Valkyre
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2002 WJ 
 
Join Date: Mar 2013
Location: Oak Harbor, Washington
Posts: 37
Wj 02 Grand Overland 4.7 HO Questions

I bought an 02 Grand Cherokee Overland and it has the 4.7L HO engine but i was told its the “J” model not the “N” model....I have no idea what the difference is other than that the airfilters are not the same can anyone explain to me what the difference is and if i am going to run into problems later im trying to put an Cold air intake and exuast on it is there ones that are great etc any tips/advice would help!?!?! thanks

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Unread 03-08-2013, 05:23 PM   #2
funkduck
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2002 WJ 
 
Join Date: Apr 2012
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You can learn about the HO engine here -
http://www.wjjeeps.com/ho_engine.htm

My opinion is an aftermarket intake is a complete waste of time and money, and an unnecessary complication on these engines.

Do a search on here for "Kolak Exhaust" for everything you could want to know about the exhaust everyone loves for these things.
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Unread 03-08-2013, 05:25 PM   #3
Valkyre
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my question was mostly whats the difference between the n and j models
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Unread 03-08-2013, 05:29 PM   #4
funkduck
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The J just means you have the HO engine, the N means you have the non-HO 4.7

See the 8th digit

http://www.wjjeeps.com/vin.htm
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Unread 03-08-2013, 05:30 PM   #5
Valkyre
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oh your my hero thanks man
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Unread 03-08-2013, 05:45 PM   #6
Darnice
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2004 WJ 
 
Join Date: Nov 2012
Location: Windsor, Ontario
Posts: 506
I thought J and N engines referred to the PCM required, J for J-tec which was 2002 and earlier. N was 2003 and 2004.
J and N have different crank sensor rings, N having more teeth and mor information on crank position.
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