Spark plugs for 2000 XJ

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Jul 13, 2011 | 06:39 PM

#16

tjwalker

CF Veteran

Joined: Nov 2010

Posts: 5,841

Likes: 117

From: In the middle of Minnesota!

Year: 1999

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by wjnfirearms

Tjwalker stated...

Funny you mention this. I've pretty much used nothing but Bosch Platinums since we've owned XJs for the past 11 years now. The vehicles have always run fine on them. This is the first I've heard anyone mention this brand causing a problem.

I've been collecting data on this from three Jeep XJ forums. I think I'm up to about twenty or so people that have had misfires that are directly related to Bosch plugs.

But not EVERYONE has issues. Some 4.0 engines run just fine with them. That makes it difficult to understand.

I'm a huge fan of most Bosch products myself, but because these issues are pretty well documented and always resolve themselves with a different brand of plug, I won't recommend them or install them.

Jul 13, 2011 | 06:53 PM

#17

jeepxj19

CF Veteran

Joined: Oct 2010

Posts: 1,756

Likes: 1

From: Salem Nh

Year: 1998

Model: Cherokee

Engine: 4.0

I just switched plugs I had bosch plug and was getting a slight misfire, I just switched to champion plugs and my rig seems to be running better

Jul 13, 2011 | 07:34 PM

#18

coueshunter

Junior Member

Joined: Jun 2011

Posts: 82

Likes: 0

From: Goodyear, Az

Year: 2001

Model: Cherokee

Engine: 4.0

I just bought a 2001 XJ that has been taken care of immensly... babied... well had a slight miss threw a P0303 misfire code. Bought new Champion 435s and pulled the old plugs. Bosch platinums.... Replaced the junk and smogged it today, perfect and it runs a TON better.

Jul 13, 2011 | 07:53 PM

#19

mopar2

Junior Member

Joined: Mar 2011

Posts: 43

Likes: 0

From: Indy

Year: 2000

Model: Cherokee

Engine: 4.0

My 2000 came with Champion RC12ECC.

Jul 13, 2011 | 08:00 PM

#20

jeepxj19

CF Veteran

Joined: Oct 2010

Posts: 1,756

Likes: 1

From: Salem Nh

Year: 1998

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by mopar2

My 2000 came with Champion RC12ECC.

Thats what I'm running now, they are exact oem recommend plugs

Jul 13, 2011 | 11:56 PM

#21

MuscleHead

Thread Starter

Senior Member

Joined: May 2011

Posts: 713

Likes: 0

From: Jackson,TN

Year: 2000

Model: Cherokee

Engine: 4.0

Mine had NGK's installed from previous owner, didn't know till i went to pull them. Im use to diesel engines, only my second gas burner ive ever owned

Jul 14, 2011 | 01:28 AM

#22

Jeepability

Member

Joined: Dec 2010

Posts: 224

Likes: 0

From: South Georgia

Year: 1998

Model: Cherokee

Engine: 4.0

when i changed mine they were bosch. i got some pretty good NGK R

Jul 14, 2011 | 09:14 AM

#23

scheetz_21

Seasoned Member

Joined: Jun 2011

Posts: 535

Likes: 0

From: Michigan

Year: 2000

Model: Cherokee

Engine: 4.0 HO

you wanna stay away from any plug that has 2 or 3 electrodes, this is what usually causes poor performance, and misfiring.. i have experienced this on several cars that Ive had complaints about misfiring and or poor performance. the electrodes get carbon stuck between them and cause it to misfire. just what Ive experienced.

Aug 28, 2011 | 09:17 PM

#24

wcjr

Junior Member

Joined: Jul 2011

Posts: 67

Likes: 1

Model: Cherokee

Quote:

Originally Posted by pikapp504

NGK's @ .035 gap. Out of the box they are NOT set properly (at least mine weren't). When I changed out the plugs that were in there, the gaps ranged from .050 to .076....obviously the OE plugs. Made a HUGE difference in gas mileage and driveability.

I have a 2001. What model number NGK's do I need? I'm going to drop by O'riellys tomorrow and get them. Just want to make sure I get the correct ones.

Aug 29, 2011 | 07:14 PM

#25

wcjr

Junior Member

Joined: Jul 2011

Posts: 67

Likes: 1

Model: Cherokee

Quote:

Originally Posted by wcjr

I have a 2001. What model number NGK's do I need? I'm going to drop by O'riellys tomorrow and get them. Just want to make sure I get the correct ones.

I noticed on some threads some are recommending NGK's and others are recommending Champion plugs. I am just looking for a model number so I know which one to buy when I go to the parts house.
Thanks