Does anybody have tips/experience on changing CPS?
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CF Veteran
Joined: Nov 2009
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From: New Jersey
Year: 1996
Model: Cherokee
Engine: 4.0 HO
Yea. After this, I'm gonna make sure I do a full tuneup, so she's in prime running condition. While figuring out while I had no spark I broke both bolts for the distributor cap which prompted me to buy a new cap and rotor, so I'm partway through the tuneup
Now just plugs and wires because I already have fresh oil in her. Then I'll call it a day and drive her till the motor blows...then rebuild it and drive it some more
Now just plugs and wires because I already have fresh oil in her. Then I'll call it a day and drive her till the motor blows...then rebuild it and drive it some moreSenior Member
Joined: Sep 2009
Posts: 575
Likes: 2
From: Virginia
Year: 2000
Model: Cherokee
Engine: 4.0 inline 6
Yea. After this, I'm gonna make sure I do a full tuneup, so she's in prime running condition. While figuring out while I had no spark I broke both bolts for the distributor cap which prompted me to buy a new cap and rotor, so I'm partway through the tuneup
Now just plugs and wires because I already have fresh oil in her. Then I'll call it a day and drive her till the motor blows...then rebuild it and drive it some more
Now just plugs and wires because I already have fresh oil in her. Then I'll call it a day and drive her till the motor blows...then rebuild it and drive it some more
Thread Starter
CF Veteran
Joined: Nov 2009
Posts: 1,261
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From: New Jersey
Year: 1996
Model: Cherokee
Engine: 4.0 HO
UPDATE: I changed out the CPS today, which was a PITA, but nothing to cry over. Tried to start it, still no spark. Went to junkyard and got a coil, very weak orange spark, and it almost started it for a second. So I assume it needs a new coil, unless somebody else thinks it could be a different problem. I need all the help I can get, I hate electrical. Also, I noticed when it half-started for a second, my exhaust was very loud. The CPS caused a bad backfire when it went and exploded my muffler in twain! It's a pretty funny sight. So when it's running, what should I get...straight pipe, cherry bomb turbo, or cherry bomb glasspack? Those are my choices with my income as of now.
Last edited by 96Cherokee113; Dec 23, 2009 at 07:33 PM.
Thread Starter
CF Veteran
Joined: Nov 2009
Posts: 1,261
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From: New Jersey
Year: 1996
Model: Cherokee
Engine: 4.0 HO
Forgot to add that I checked power going to the coil and it was right around 12 volts. So the coil is getting good power, it's just not making good spark. I know the CPS has to do with the spark, but it's brand new and I'm pretty sure it isn't adjustable, so it has to be the coil, right? Any insight would be great. Thanks.
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Joined: Jul 2009
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From: Chico,ca
Year: 89
Model: Cherokee
Engine: 4.0
It could be the coil,but before you start spending alot of money on parts I would suggest buying a cheap multi meter and manual so you can test it,just because the coil you got today is from a jy does not mean it is bad.
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CF Veteran
Joined: Nov 2009
Posts: 1,261
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From: New Jersey
Year: 1996
Model: Cherokee
Engine: 4.0 HO
I checked it with a multimeter. It had 12 volts going into the coil. It's just what's coming out of the coil is a dull orange spark. It was a steady spark, just very weak. I have a manual for my Jeep, so I'll put it into use for this one. I'll be off to work in about an hour though, so I don't have much time to mess around with it, so it'll have to wait until tomorrow. I also forgot to mention earlier that I only got a JY coil because when I went to start it with the new CPS, my coil wasn't putting out any spark, so I guess the backfire caused the coil to blow or something. My buddy is going to the junkyard because I forgot something there and he's gonna pick up another coil off an XJ we know that ran when it entered the junkyard. We're real cool with the owner so it'll be free, that why I have no problem just changing the coil again. Thanks for the help and Merry Christmas.
No easy way to do it. The bolt is a 11mm and you will need about a foot and a half extension. The only way to get to it is from the bottom driveside. Good luck with it. Merry Christmas
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Joined: Nov 2009
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From: New Jersey
Year: 1996
Model: Cherokee
Engine: 4.0 HO
I already changed out the CPS. The new problem is that my original coil had no spark and the JY coil I got had weak orange spark. I'm thinking it's probably a bad coil I grabbed, but any other suggestions are appreciated. Thank you everyone and Merry Christmas.
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Joined: Nov 2009
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From: New Jersey
Year: 1996
Model: Cherokee
Engine: 4.0 HO
Yea, I guess when the CPS went it caused some sort of chain reaction that blew out my coil and Camshaft Positioning Sensor. So I bought a new coil, and my distributor was already messed up (which is where the Camshaft Positioning Sensor is located) due to snapping both bolts that hold the cap on. I broke one of the sides completely off so instead of rigging it up, I'm getting a new distributor from the junkyard today. Also, when the CPS crapped out and I lost sparked it caused a bad backfire which blew out my muffler. I don't know if I posted a picture, so here it is.
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