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Feb 3, 2013 | 11:00 PM

ctjkelley

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Joined: Oct 2011

Posts: 844

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Model: Cherokee

Spark plugs

What are the best plugs and wires for a 98' 4.0?

Feb 3, 2013 | 11:02 PM

ZINGGG

CF Veteran

Joined: Oct 2011

Posts: 4,440

Likes: 3

From: Seal Beach, CA

Year: 1996

Model: Cherokee

Engine: 4.0 HO Straight Six

Champion copper plugs and Belden wires

Feb 3, 2013 | 11:02 PM

The Rooster

CF Veteran

Joined: Feb 2011

Posts: 3,074

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From: Bergen County, New Jersey U.S.A.

Year: 1990 Laredo

Model: Cherokee

Engine: 4.0 Inline 6 Renix

Quote:

Originally Posted by ctjkelley

What are the best plugs and wires for a 98' 4.0?

stock Champion Copper plugs and 8.5 magnacor wires

Feb 3, 2013 | 11:37 PM

JeepsAreForSpeed

Member

Joined: Apr 2012

Posts: 154

Likes: 1

From: Pa

Year: 1992

Model: Cherokee

Engine: 4.0

I had a performance gain when I put the champions in gapped to .040 and msd wires.

Feb 4, 2013 | 06:37 AM

tjwalker

CF Veteran

Joined: Nov 2010

Posts: 5,841

Likes: 117

From: In the middle of Minnesota!

Year: 1999

Model: Cherokee

Engine: 4.0

Champion copper plugs gapped to 035

Plenty of good quality wire options to choose from........just stay away from cheap wires!

Feb 4, 2013 | 07:03 AM

ctjkelley

Thread Starter

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Joined: Oct 2011

Posts: 844

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Model: Cherokee

What parts store carry the champions....and wires range from $15-$31-82....kind of a gap from the $31-$82...Bosch was 31 msd was 82...are the Bosch wires worth it?

Feb 4, 2013 | 07:45 AM

diskman

Senior Member

Joined: Sep 2008

Posts: 897

Likes: 12

From: Sioux Falls, SD

Year: 1999

Model: Cherokee(XJ)

Engine: 4.0L

I found that the dealers wires were cheaper than the "premium" wire sets at Advance/O'Reilly etc. I picked up a set of Mopar wires for under $50. Exact same as the original ones too.

Figure that the original wires lasted 200K miles. Never had good luck with auto-store wires. At all...

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Feb 4, 2013 | 08:13 AM

salad

Herp Derp Jerp

Joined: Nov 2011

Posts: 18,251

Likes: 17

From: Parham, ON

Year: 1999

Model: Cherokee

Engine: 4.0L OBD-II

I love my NGK wires. Same good quality as Belden but they're actually numbered! Helps the tard in all of us. I see them on sale up here for around $24 I think, US prices I guess should be around that.

Champion or NGK copper plugs at 0.035". I wouldn't bother with changing gap unless you've done some upgrades... In which case you should already know what kind of plugs to run lol

Last edited by salad; Feb 4, 2013 at 08:16 AM.