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Old 08-16-2011, 12:35 AM   #1
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Default CPS-What a nightmare!

As many of you know, I have been trying to figure out why I have been getting check engine lights near daily. Most of the codes are for engine misfire codes. I have been replacing parts, trying to figure out what is going on. This includes: Cap, rotor, wires, injectors, plugs, cleaned throttle body, seafoamed engine....nothing worked. The Jeep ran great, just threw random codes.

So, as my quest continued, I decided to replace the Crank position sensor and, if that didnt work, the sensor in the distibutor. So tonight, I dug in and replaced the CPS. What a royal pain in the ***. The engineers couldnt have put that thing in a tougher spot to get to. On top of that, I dropped one of the bolts into the hole in the bell housing. So I had to remove the inspection cover and luckily found the bolt. Finally got it all beck together and noticed that I forgot to put back on that crappy little plastic piece that covers the hole in the bell housing. I dont think it is a big deal so I left it off. Im sure as hell not removing that CPS again to put it back on! I discovered the wires on my CPS were melted and a bare wire was showing through. My guess, is it was randomly grounding out and causing the misfire codes. I'll drive the Jeep to work tomorrow and see If I get any codes. I betting I found the problem.

So, if your having misfire problems, check your CPS wires for melting and shorts!

Thanks,

Flash
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Last edited by Flash1034; 08-16-2011 at 12:43 AM.
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Old 08-16-2011, 12:49 AM   #2
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Been there done that. It sucks. These people who design cars seem like design alot of parts like theyll never have to be changed again. Its really stupid.
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Old 08-16-2011, 12:52 AM   #3
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I can change it in 2 mins on my rig lol
One nice thing about having a tcase drop lol.
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Old 08-16-2011, 10:47 AM   #4
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Ok. Drove to work today and no check engine light! Yeah, Yippee, Yahoo! Think I finally got it figured out.

Flash
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Old 08-16-2011, 11:36 AM   #5
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I know that you don't want to hear this but you should have that plastic piece installed. I've read that it acts as a shim as well as a cover so that the sensor might not be set exactly right without it. Just saying. Next time you pull the CPS just put a jack under your trans. cross member and lower everything. It will give you better access. They can be changed out in about 30 min.
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Old 08-16-2011, 12:25 PM   #6
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Quote:
Originally Posted by Ziggee View Post
Next time you pull the CPS just put a jack under your trans. cross member and lower everything. It will give you better access. They can be changed out in about 30 min.
I did mine in less than 30 minutes and the XJ is bone stock.

No need to lower anything to get to it.


Changing the CPS can be real easy with the right tools.

I was faced with changing mine, when I got under there with a long extension and a ratchet I quiclkly realized I had the WRONG TOOLS.
I went back into the house and emerged with my AIR RATCHET small compressor, long extension and socket.
With the above tools doing the CPS swap is a breeze.
I cannot tell you how easy having an AIR RATCHET has made my life many times.

Does two things well ....
1) Speeds up the work process
2) Allows me to get into areas ( like the CPS ) where a conventional ratchet just wont work well.


.

Last edited by KD3NE; 08-16-2011 at 12:27 PM.
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Old 08-16-2011, 01:18 PM   #7
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Another good idea I have gotten, is to cut the bottoms of the holes out on the new unit. Then you do not have to remove the bolts, just loosen them, and slide the CPS out. I got this little trick from BlueXJ...
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Old 08-16-2011, 05:41 PM   #8
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Ive gotten a few out of the JY
I just bring a cordless saw and cut a hole
in the floor to get to them quick
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Old 08-17-2011, 07:48 AM   #9
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Quote:
Originally Posted by Char92dj8 View Post
Ive gotten a few out of the JY
I just bring a cordless saw and cut a hole
in the floor to get to them quick
So you're the guy that destroys a ton of other parts to get to the one you need??

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