Spark plug wires

Tiny
DARWINSTI
  • MEMBER
  • 1995 JEEP WANGLER YJ
  • 2.5L
  • 4 CYL
  • 4WD
  • MANUAL
  • 146,789 MILES
Plug wires were changed last year when we got the jeep. Along with distributor cap rotor and plugs. We followed the same pattern that was there. It has always had a slight hesitation and has cut off at idle off and on. Going to change everything again and now have the manual for it. It shows however, the diagram for our vehicle is not the pattern we have on the distributor, but the one for up to a 1987-1991? Could this be why it has never run 100%?
Thanks in advance.
Thursday, August 10th, 2017 AT 6:19 PM

4 Replies

Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
If you had a wire crossed (due to a bad diagram) then your Jeep would run really rough. Not just a slight hesitation, but major hesitation, shaking, skipping, and probably even backfiring.

What I would ask is what spark plugs and wires did you use? Often times, using plugs/wires that aren't stock will cause issues, as they have different spark strength than what the engine is designed for. So basically, always go with stock plugs. Split fire plugs and other "upgrades" usually don't help anything.

Also, just a tip, when changing spark plugs, only remove one plug wire at a time, so as to avoid confusion and potentially crossing the wires.
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Thursday, August 10th, 2017 AT 6:42 PM
Tiny
DARWINSTI
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  • 2 POSTS
So which is the right one? It is a 1995, but the wires on the Jeep are the same as the 1987-1991 diagram. I am kind of confused.
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Thursday, August 10th, 2017 AT 6:59 PM
Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
Here is what your diagram should be for a 1995. I am pulling up the other one in a second for comparison.
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Thursday, August 10th, 2017 AT 7:13 PM
Tiny
HARRY P
  • MECHANIC
  • 2,292 POSTS
This is for a 1991. It is basically the same, just with the distributor in a different location (which has no effect on performance). The actual firing order and direction that the distributor turns is the same.

So basically, either diagram would get the job done for you.
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Thursday, August 10th, 2017 AT 7:16 PM

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