Rough idle after swapping spark plugs
Junior Member
Joined: May 2008
Posts: 15,016
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From: +34° 25' 35.67", -81° 21' 12.04"
Year: 1993
Engine: 4.0
Use a test light to ground out each cylinder while it's running.
Or you could just unplug a wire one at a time. I tend to get shocked if I do it that way.
If the engine runs worse when you unplug it you know that cylinder was working right. If you pull a wire and it doesn't make a difference then you've found your problem or at least the location of your problem.
...what year is the Jeep?
Or you could just unplug a wire one at a time. I tend to get shocked if I do it that way.
If the engine runs worse when you unplug it you know that cylinder was working right. If you pull a wire and it doesn't make a difference then you've found your problem or at least the location of your problem.
...what year is the Jeep?
Thread Starter
Seasoned Member
Joined: Jun 2012
Posts: 261
Likes: 0
From: Hartland Michigan
Year: 1999
Model: Cherokee
Engine: 4.0L I6
Use a test light to ground out each cylinder while it's running.
Or you could just unplug a wire one at a time. I tend to get shocked if I do it that way.
If the engine runs worse when you unplug it you know that cylinder was working right. If you pull a wire and it doesn't make a difference then you've found your problem or at least the location of your problem.
...what year is the Jeep?
Or you could just unplug a wire one at a time. I tend to get shocked if I do it that way.
If the engine runs worse when you unplug it you know that cylinder was working right. If you pull a wire and it doesn't make a difference then you've found your problem or at least the location of your problem.
...what year is the Jeep?
and its a 99
Last edited by rockdoon; Aug 30, 2012 at 12:42 PM.
Thread Starter
Seasoned Member
Joined: Jun 2012
Posts: 261
Likes: 0
From: Hartland Michigan
Year: 1999
Model: Cherokee
Engine: 4.0L I6
ok i found a diagram and the way it showed the wires, mine were all screwed up.... so i switched them to how the diagram said and now it wont start... it will crank a few times then the cranking will slow and it almost sounds like something is binding
Junior Member
Joined: May 2008
Posts: 15,016
Likes: 11
From: +34° 25' 35.67", -81° 21' 12.04"
Year: 1993
Engine: 4.0
You're out 180 degrees.
I thought pops was a mechanic...
You must be sure that Cylinder 1 wire is on cylinder one. I bet you're off by one cylinder all the way down the line.
I thought pops was a mechanic...
You must be sure that Cylinder 1 wire is on cylinder one. I bet you're off by one cylinder all the way down the line.
Thread Starter
Seasoned Member
Joined: Jun 2012
Posts: 261
Likes: 0
From: Hartland Michigan
Year: 1999
Model: Cherokee
Engine: 4.0L I6
ok i looked at the distributer i have the cylinder 1 wire going to the spot just left of the screw when looking from the front of the jeep, then going clockwise its 5, 3, 6, 2, 4 so it all seems to be correct
and he was, but hes in his 70's and mistakes happen
and he was, but hes in his 70's and mistakes happen
Last edited by rockdoon; Aug 30, 2012 at 01:30 PM.
Junior Member
Joined: May 2008
Posts: 15,016
Likes: 11
From: +34° 25' 35.67", -81° 21' 12.04"
Year: 1993
Engine: 4.0
Ah, I would start there.
Make 100% sure it's the correct rotor button. Is it the kind that has the tab that locates it or is it the kind that locates inside the slot?
If it's just flopping around in there would cause this.
Carefully compare the two. If it's good then I would pull all the wires off and put the old ones back on and see what happens.
Make 100% sure it's the correct rotor button. Is it the kind that has the tab that locates it or is it the kind that locates inside the slot?
If it's just flopping around in there would cause this.
Carefully compare the two. If it's good then I would pull all the wires off and put the old ones back on and see what happens.
Junior Member
Joined: May 2008
Posts: 15,016
Likes: 11
From: +34° 25' 35.67", -81° 21' 12.04"
Year: 1993
Engine: 4.0
They aren't wrong if you locate off of the screw...
Who cares which way it's oriented. Stand at the radio antenna and look at it and they'll be right.
Who cares which way it's oriented. Stand at the radio antenna and look at it and they'll be right.
