What Spark Plugs Do You Use In Your 4.0?
07-01-2016 | 09:27 AM
#31
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,566
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Now I know thanks, I just wanted to be sure that Is all! Didn't mean to jack this thread I'm only on here for help, I've seen you also recommend the champion plugs too. You
don't have to be a wise guy I don't care who you are on here! Crusier54 If you don't want to help a mother ****er then leave it at that don't reply! Now I'm done.
don't have to be a wise guy I don't care who you are on here! Crusier54 If you don't want to help a mother ****er then leave it at that don't reply! Now I'm done.
07-01-2016 | 11:17 AM
#33
::CF Administrator::
Joined: Feb 2011
Posts: 14,474
Likes: 790
From: Blunt, South Dakota
Year: 97
Model: Cherokee (XJ)
Engine: 4.6 stroker
Now I know thanks, I just wanted to be sure that Is all! Didn't mean to jack this thread I'm only on here for help, I've seen you also recommend the champion plugs too. You
don't have to be a wise guy I don't care who you are on here! Crusier54 If you don't want to help a mother ****er then leave it at that don't reply! Now I'm done.
don't have to be a wise guy I don't care who you are on here! Crusier54 If you don't want to help a mother ****er then leave it at that don't reply! Now I'm done.
...then fill out one of these.
07-01-2016 | 07:16 PM
#34
Member
Joined: Nov 2014
Posts: 150
Likes: 0
From: Woodstock, GA, originally from S. CA.
Year: 1987 149k, original owner
Model: Cherokee
Engine: 4.0
. He tells me that all the time!
07-01-2016 | 07:21 PM
#35
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,566
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
07-03-2016 | 02:32 PM
#38
CF Veteran
Joined: Jan 2012
Posts: 2,208
Likes: 4
From: Ocean County, NJ
Year: 1998
Model: Cherokee
Engine: 4.0L
07-03-2016 | 05:21 PM
#39
Junior Member
Joined: Jun 2014
Posts: 78
Likes: 4
Model: Cherokee
07-03-2016 | 06:54 PM
#40
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 13
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
I'm going to go out on a limb here and postulate that the engineering specification changed based on feedback from the field. I do not believe there were any signifcant changes to the ignition system or the head's heat dissipation until 2000 model year (0331 + coil packs). But, there were millions of hours logged. Changes like this happen all the time. Over nearly 30 years of 4.0L and Jeep history, the stupid heater control valve was dropped, vacuum axle disconnect dropped, spark plug spec changed, and the oil spec changed - but barely anything else did.
07-04-2016 | 01:27 AM
#42
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,566
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
07-04-2016 | 09:22 AM
#43
CF Veteran
Joined: Apr 2009
Posts: 4,734
Likes: 11
Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
Extended projection ended in 1999!
I'm going to go out on a limb here and postulate that the engineering specification changed based on feedback from the field. I do not believe there were any signifcant changes to the ignition system or the head's heat dissipation until 2000 model year (0331 + coil packs). But, there were millions of hours logged. Changes like this happen all the time. Over nearly 30 years of 4.0L and Jeep history, the stupid heater control valve was dropped, vacuum axle disconnect dropped, spark plug spec changed, and the oil spec changed - but barely anything else did.
I'm going to go out on a limb here and postulate that the engineering specification changed based on feedback from the field. I do not believe there were any signifcant changes to the ignition system or the head's heat dissipation until 2000 model year (0331 + coil packs). But, there were millions of hours logged. Changes like this happen all the time. Over nearly 30 years of 4.0L and Jeep history, the stupid heater control valve was dropped, vacuum axle disconnect dropped, spark plug spec changed, and the oil spec changed - but barely anything else did.
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