2005-06 Jeep OPDA_CPS_Distributor Failure - Page 331 - JeepForum.com
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post #4951 of 5422 Old 07-03-2014, 06:28 PM
psouza1943
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For those interested in the technical details of one aspect of the OPDA sensor failures from DOORMAN and possibly Crown, I have included this set of pictures from the work I have done, so far, on the problem.

Other than outright failure to perform, this picture seems to portray the problem. In short the MOPAR sensor positive going data pulses are approximately 1/2 the width of the output of the defective sensors. A total of six sensors, were tested, and the enclosed pics are representative of the total data.


Phil

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post #4952 of 5422 Old 07-03-2014, 11:32 PM
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Derived a .jpeg image for those with no access to adult computers.

Caliper calculations show the Mopar duty cycle approx %36 and the Doorman is %61. We will never know what the exact specification from Chrysler/Fiat is, but can guess that the Doorman figure just exceeds the upper limit and hope the Mopar is near the optimum center. Not a spec derivation, but is a half assed reference for relative comparisons..

Phil
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post #4953 of 5422 Old 08-06-2014, 08:12 AM
keithert
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So should I keep using my oil cup modded OPDA or switch to the Crown unit? Sounds like I should wait a few months and see if the Crown has further issues.

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post #4954 of 5422 Old 08-06-2014, 08:23 AM
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Maybe you should pull your modded unit and see if there is any play in the bushings, if not keep using it, if so switch to the crown. My stock unit looked almost new when I pulled it, and probably didn't need to switch it to the crown, but better safe than sorry.
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post #4955 of 5422 Old 08-06-2014, 08:44 AM
svandell
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Quote:
Originally Posted by psouza1943 View Post
Derived a .jpeg image for those with no access to adult computers.

Caliper calculations show the Mopar duty cycle approx %36 and the Doorman is %61. We will never know what the exact specification from Chrysler/Fiat is, but can guess that the Doorman figure just exceeds the upper limit and hope the Mopar is near the optimum center. Not a spec derivation, but is a half assed reference for relative comparisons..

Phil
Are both waveforms taken from the same OPDA just swapping the sensors?
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post #4956 of 5422 Old 08-06-2014, 12:22 PM
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Quote:
Originally Posted by keithert View Post
So should I keep using my oil cup modded OPDA or switch to the Crown unit? Sounds like I should wait a few months and see if the Crown has further issues.
It appears the Dorman units are having issues. I'm not familiar with any "Crown" units.

As for the OPDA bearing issues, the SG Mod is the way to go!

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post #4957 of 5422 Old 08-06-2014, 12:35 PM
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Quote:
Originally Posted by KX6D View Post
It appears the Dorman units are having issues. I'm not familiar with any "Crown" units.

As for the OPDA bearing issues, the SG Mod is the way to go!
you must not have read this thread recently....

http://www.jeepforum.com/forum/f9/20...l#post23609113

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post #4958 of 5422 Old 08-06-2014, 02:16 PM
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Originally Posted by JStrider View Post
you must not have read this thread recently....

http://www.jeepforum.com/forum/f9/20...l#post23609113
True! Been too busy bringing the SG Mod to mass production!

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post #4959 of 5422 Old 08-06-2014, 04:33 PM
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Still using the SG unit no issues.

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post #4960 of 5422 Old 08-06-2014, 09:50 PM
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The SG Mod SOLVES the poor lubrication issues with all units (Factory/LDI, Dorman, Crown). You will continue to hear about failures of the all the other units, except for the SG Mod.

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post #4961 of 5422 Old 08-07-2014, 07:14 AM
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Quote:
Originally Posted by KX6D View Post
The SG Mod SOLVES the poor lubrication issues with all units (Factory/LDI, Dorman, Crown). You will continue to hear about failures of the all the other units, except for the SG Mod.
Doesn't the Crown unit included a different bushing and an oil channel to address the lubrication?

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post #4962 of 5422 Old 08-07-2014, 07:20 AM
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Originally Posted by biffgnar View Post
Doesn't the Crown unit included a different bushing and an oil channel to address the lubrication?
That's the way I understand it. They used a design much like the older OPDA/distributors.

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post #4963 of 5422 Old 08-07-2014, 08:01 AM
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Originally Posted by biffgnar View Post
Doesn't the Crown unit included a different bushing and an oil channel to address the lubrication?
Those have been done in the past by members here, long before Crown made theirs. The problem is the oil still doesn't get up to the top bearing. The SG Mod eliminates the need to have ANY oil at the top bearing.

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post #4964 of 5422 Old 08-07-2014, 09:15 AM
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Quote:
Originally Posted by KX6D View Post
The SG Mod SOLVES the poor lubrication issues with all units (Factory/LDI, Dorman, Crown). You will continue to hear about failures of the all the other units, except for the SG Mod.
Like other units, the SG Mod can fail at the lower bushing though. Its not perfect either. I had to replace my SG Mod unit after about a year because the lower bushing was all hollowed out. It was very dissappointing. I think its luck of the draw if you get one that is milled strait or not.

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post #4965 of 5422 Old 08-07-2014, 12:30 PM
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Originally Posted by Fargo View Post
Like other units, the SG Mod can fail at the lower bushing though. Its not perfect either. I had to replace my SG Mod unit after about a year because the lower bushing was all hollowed out. It was very dissappointing. I think its luck of the draw if you get one that is milled strait or not.
Your failure would have happened with any of the units. At least the Dorman and Crown units followed the SG Mod's lead and used oilite bushings, which is an improvement to the stock bushing. You most likely have an alignment problem that has been documented here but is very rare on most Jeeps.

The SG Mod addresses the upper bearing primarily. This is the huge problem as all other units still rely on grease or mist. The lower bushing, with the mods to open up the oiling holes, are about the same for all three.

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