muddydirtyxj
NAXJA Forum User
ANYONE KNOW THE PLUG GAP ON AN 89 4.0L 4X4
Plug Gap
- Thread starter muddydirtyxj
- Start date
kevin s
NAXJA Forum User
- Location
- cincinnati, ohio
0.035
muddydirtyxj
NAXJA Forum User
THANKS
Alright I've got one for ya.
How come everyone says to gap my plugs to .035 when the factory plugs were gapped to .045? Why is there a discrepency? I thought it was a screw up until I checked the gap on all of the factory orginals when I pulled them out of my 99 and found them all to be .045, anyone know why this is?
Matt
How come everyone says to gap my plugs to .035 when the factory plugs were gapped to .045? Why is there a discrepency? I thought it was a screw up until I checked the gap on all of the factory orginals when I pulled them out of my 99 and found them all to be .045, anyone know why this is?
Matt
GI-John
NAXJA Forum User
- Location
- Mount Holly, NJ
How many miles were on the factory plugs when you pulled them?
The gap will change as the plugs wear. That's the reason some people go to platinum plugs.....
John
The gap will change as the plugs wear. That's the reason some people go to platinum plugs.....
John
martin
NAXJA Forum User
- Location
- Huntsville, AL
The first place to look for plug gap is on that sticker in the engine bay, you know the one that talks about emission stuff, says you can't adjust idle speed, etc.
My 88 XJ 4.0 say .035" but when they go to the higher power ignition systems the gap increases. I think my 2001 buick with the 3800 has a .050" gap on the plugs.
So on the later XJs the gap may be more.
My 88 XJ 4.0 say .035" but when they go to the higher power ignition systems the gap increases. I think my 2001 buick with the 3800 has a .050" gap on the plugs.
So on the later XJs the gap may be more.
2offroad
NAXJA Forum User
- Location
- Concord NC
my 98 says .035 gap, but with a firepower kit you can open it up to.065
