Chrysler is paying to install a new cam (2005/2006 owners should read this) - Page 14 - JeepForum.com

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post #196 of 1818 Old 07-18-2010, 05:39 PM
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Quote:
Originally Posted by jkp View Post
Let us know what you find, I've got about 58K on mine. No noise or miss.
I didn't get to it today, but I'm honestly not worried about it right now. My engines running fine, if i start to feel a misfire then I'll yank the gear and check.

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post #197 of 1818 Old 07-18-2010, 05:48 PM
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I've seen the hold down bolt snap off with no prior symptoms...
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post #198 of 1818 Old 07-18-2010, 05:53 PM
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I'd check it, but I'm also kinda nervous to do it on my own with just reading forum stuff. Knowing my luck something will get screwed up going back in and I'll be in "limp" mode and throwing codes.
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post #199 of 1818 Old 07-19-2010, 07:51 AM
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I have an 05 with 19k miles and I am worried about this too. Pruchased 11/05and I am still covered by my 7/70 for another 2.5 years.

I thought about checking this out but maybe I should leave it alone until a problem starts. I don't have any issues but this problem concerns me.
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post #200 of 1818 Old 07-19-2010, 07:57 AM
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When it goes will it take out just the cam or will the engine be toast? One poster said the engine would go into limp home mode. Will this shut down keep it from damage?

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post #201 of 1818 Old 07-19-2010, 08:48 AM
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I would like to know why Chrysler did not put out a recall to fix this issue. I am sure they have researched it and believe the engines will make it to 70k+ with the defective part so they gamble with the cost of a recall and warranty claims.
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post #202 of 1818 Old 07-19-2010, 09:15 AM
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I'd check it, but I'm also kinda nervous to do it on my own with just reading forum stuff. Knowing my luck something will get screwed up going back in and I'll be in "limp" mode and throwing codes.
I agree with Zach06. Everything is good right now and it would be just my luck to sneeze at the wrong time & screw up something. IMO, if I'm going to go to the trouble of checking it I might as well get a new one and replace it.

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post #203 of 1818 Old 07-19-2010, 03:49 PM
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Originally Posted by keithert View Post
When it goes will it take out just the cam or will the engine be toast? One poster said the engine would go into limp home mode. Will this shut down keep it from damage?
The CPS assembly is turns the oil pump, and the cam shaft turns the CPS assembly. So if the gear on the CPS fails then you loose your oil pump which will result in serious engine damage.

The reason Chrysler is being so low key about the issue is the company that was making the CPS assembly went out of business and they don't currently have anyone producing them so their stock is very limited. They know if they put out an active recall they will have ALLOT of pissed Jeep owners because they don't have any new CPS assemblies to honor the recall.

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I agree with Zach06. Everything is good right now and it would be just my luck to sneeze at the wrong time & screw up something. IMO, if I'm going to go to the trouble of checking it I might as well get a new one and replace it.
Just because "everything is good now" doesn't mean that the gear isn't wearing down. IF you catch it early all you have to is replace the CPS assembly but if you wait till it shows symptoms then your camshaft gear has taken damage and your engine will require a tear down and rebuilt and a LONG LONG fight with Chyrsler to get them to cover it.

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post #204 of 1818 Old 07-19-2010, 03:57 PM
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The CPS assembly is turns the oil pump, and the cam shaft turns the CPS assembly. So if the gear on the CPS fails then you loose your oil pump which will result in serious engine damage.
Not true. Since this is also the distributor drive, you lose your spark so the engine immediately shuts down before it has a chance to do any damage.

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post #205 of 1818 Old 07-19-2010, 04:54 PM
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Not true. Since this is also the distributor drive, you lose your spark so the engine immediately shuts down before it has a chance to do any damage.
No you don't loose your spark, the signal for the spark is generated from the crank shaft position sensor on the back on the engine on the flywheel. The camshaft position sensor assembly gives the input for the fuel timing HOWEVER the engine will run without this signal in a "limp mode" liming you to 2500RPM.

On a 05 you don't have a "distributor" you a coil pack with a coil for each cylinder. What is in place of where the distributor cap was is the CPS assembly.

What happens is the CPS starts to strip out because of excessive gear wear. As as result of this it turns the oil pump slower and slower which results in lower oil pressure which you don't notice till it hits 7psi because of the "fake oil pressure gauge"

The engine will run with a stripped out CPS assembly it just won't run faster than 2500rpm which is plenty fast to do damage due to lack of oil pressure.


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post #206 of 1818 Old 07-19-2010, 05:23 PM
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The engine will run with a stripped out CPS assembly it just won't run faster than 2500rpm which is plenty fast to do damage due to lack of oil pressure.
While your knowledge of the ignition system is better than my recollection (boy was I off), my experience disagrees with your theory. My engine died suddenly and catastrophically when my CPS/oil pump drive gear stripped out. My oil pressure suddenly went to zero, and my engine immediately shut down. Now it's possible that the ignition was actually firing and the timing was so far off that the engine wouldn't run. Kind of hard to tell. But the engine did stop and would not run after that. I was 100 miles from home in the middle of nowhere after a long day which had just gotten a lot longer.

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post #207 of 1818 Old 07-27-2010, 09:07 PM
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Okay just wondering after reading most of this, so do I avoid all late model 2004 to 2006 Wranglers? This sounds like a pretty major **** up. Like alot of you guys have said, Chrysler still has to tear into the engine to properly fix this, otherwise is every other TJ in this year range waiting to develop this problem? What an ****ty ordeal.
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post #208 of 1818 Old 07-27-2010, 11:02 PM
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Originally Posted by TheFog View Post
No you don't loose your spark, the signal for the spark is generated from the crank shaft position sensor on the back on the engine on the flywheel. The camshaft position sensor assembly gives the input for the fuel timing HOWEVER the engine will run without this signal in a "limp mode" liming you to 2500RPM.

On a 05 you don't have a "distributor" you a coil pack with a coil for each cylinder. What is in place of where the distributor cap was is the CPS assembly.

What happens is the CPS starts to strip out because of excessive gear wear. As as result of this it turns the oil pump slower and slower which results in lower oil pressure which you don't notice till it hits 7psi because of the "fake oil pressure gauge"

The engine will run with a stripped out CPS assembly it just won't run faster than 2500rpm which is plenty fast to do damage due to lack of oil pressure.


FOG
Well FYI, the only thing the crank shaft position sensor does is tell the PCM the engine speed and crank position. The camshaft position sensor does the same as the old distributor type ignitions telling which cylinder should get spark. Hence if your gear is stripped on this cps shaft, your engine will not run,,, nope ain't gonna happen. Also there are only three coil packs on these engines, not one for every cylinder. The coil packs fire two cylinders at a time, one that is in compression/power stroke and the dead one that is in exhaust stroke. Just wanted to give you a heads up on this in case you try changing your CPK sensor thinking it will improve your spark management.

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post #209 of 1818 Old 07-27-2010, 11:53 PM
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I guess I'll take another stab at it. I guess I have to worry about it considering my Jeeps build date was April, 7th 2006

Last edited by 2006_Sport; 07-28-2010 at 12:52 AM.
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post #210 of 1818 Old 07-28-2010, 10:54 AM
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Originally Posted by jeep06 View Post
Well FYI, the only thing the crank shaft position sensor does is tell the PCM the engine speed and crank position. The camshaft position sensor does the same as the old distributor type ignitions telling which cylinder should get spark. Hence if your gear is stripped on this cps shaft, your engine will not run,,, nope ain't gonna happen.
This certainly agrees with my experience.

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