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Unread 04-27-2012, 08:26 AM   #3091
JustinCHorst
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Quote:
Originally Posted by chevy2169 View Post
MAy seem like a dumb question but I'm not sure of the answer. If an 05 or 06 engine does fail, can't you replace it with an earlier 4.0 from an 04 for example? Or is the ECU completely different?
Its different, otherwise we would all just replace our opda with 04's...just mod the opda its not that big of a deal unless you decide to ignore the issue all together.

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Unread 04-27-2012, 08:30 AM   #3092
chevy2169
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Originally Posted by keithert View Post
The pre 05 has a completely different ECU so you can't just swap the parts. Plus if you are in an area with emissions testing I don't believe you can legally put an older engine into a vehicle.
Bummer. Oh well it was worth asking.

That being said. I'm doing an oil change today and decided to go with the Valvoline VR-1 "Racing" oil. Last oil change i switched from regular dino to mobil 1 full synthetic. I shouldn't run into any problems going to VR-1 should I?
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Unread 04-27-2012, 08:48 AM   #3093
keithert
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Quote:
Originally Posted by chevy2169 View Post
Bummer. Oh well it was worth asking.

That being said. I'm doing an oil change today and decided to go with the Valvoline VR-1 "Racing" oil. Last oil change i switched from regular dino to mobil 1 full synthetic. I shouldn't run into any problems going to VR-1 should I?
I went from Mobil 1 to the VR1 and actually solved an issue. With Mobil1 my rear main seal was leaking enough that I lost oil over time. With the VR1 the leak all but stopped. I don't think you will have a problem going back to dino.
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Unread 04-27-2012, 08:51 AM   #3094
chevy2169
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Originally Posted by keithert View Post
I went from Mobil 1 to the VR1 and actually solved an issue. With Mobil1 my rear main seal was leaking enough that I lost oil over time. With the VR1 the leak all but stopped. I don't think you will have a problem going back to dino.
Good to know. Thanks for the tip buddy.
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Unread 04-27-2012, 09:21 AM   #3095
pwmac
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Quote:
Originally Posted by chevy2169 View Post
MAy seem like a dumb question but I'm not sure of the answer. If an 05 or 06 engine does fail, can't you replace it with an earlier 4.0 from an 04 for example? Or is the ECU completely different?
======
Its a no go for sure. The 04, 05, and 06 are each electrically different from each other. The ECUs are completely different.

Having said that a swap that includes the wire harness, sensors and the multiple ECUs is certainly doable. Of course going to an older motor is $illegal$ if you ever get inspected. There are many issues that drove these changes and they did not all have to do with emissions.
PaulW
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Unread 04-27-2012, 09:43 AM   #3096
keithert
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Originally Posted by pwmac View Post
There are many issues that drove these changes and they did not all have to do with emissions.
PaulW
What are some of them?
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Unread 04-27-2012, 10:44 AM   #3097
pwmac
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Originally Posted by keithert View Post
What are some of them?
========
In our experience
Electrical. The main issue with the 04 vis connectors and intermittant wire connections. Heat affects the auto computer. Anyway trouble shooting usually defeates even the best factory trained mechanics. The DIY guys usually replace wires and connectors. Even then we never know it the thing will get home. Limp mode is the pits.
The real solution is to get a later model.
PW
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Unread 04-28-2012, 08:22 AM   #3098
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Quote:
Originally Posted by pwmac View Post
======
Its a no go for sure. The 04, 05, and 06 are each electrically different from each other. The ECUs are completely different.

Having said that a swap that includes the wire harness, sensors and the multiple ECUs is certainly doable. Of course going to an older motor is $illegal$ if you ever get inspected. There are many issues that drove these changes and they did not all have to do with emissions.
PaulW
I wish that someone that deals with the ECU's would just write a program to allow the use of an 04' or older OPDA with the 05' and 06' ECU's. The way I understand the difference is that the larger target wheel on the newer units is necessary to provide more " pulses" per engine revolution to the ECU to allow more adjustment in the how the engine runs in regard to making it more emission friendly. This has been mandated by the government and all the manufacturers modified their engines to meet these standards. GM did it with the computers themselves, a good way to go since they were changing their entire lineup of motors at the time.

Chrysler only had to get 2 more years out of the 4.0 so no doubt the the OPDA change was more cost effective.

Since the ECU stores the VIN # for when the Jeep is plugged in for inspection as long as no codes are given it should pass.

I'm not smart enough to know if this is viable or not, but wish a engineer with ECU experience could give it a try.

If not the oil cup is here to stay!
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Unread 04-29-2012, 06:28 PM   #3099
ChaseB
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Where are you guys getting the VR1? Last oil change I picked some up at O'reilly, they no longer offer it. Same situation with Autozone and Advance. Suggestions? Besides online?
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Unread 04-29-2012, 06:52 PM   #3100
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Quote:
Originally Posted by ChaseB
Where are you guys getting the VR1? Last oil change I picked some up at O'reilly, they no longer offer it. Same situation with Autozone and Advance. Suggestions? Besides online?
None of the places I have locally carry it so I have them bring it in special for me.
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Unread 04-29-2012, 06:58 PM   #3101
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Vr1

Quote:
Originally Posted by ChaseB View Post
Where are you guys getting the VR1? Last oil change I picked some up at O'reilly, they no longer offer it. Same situation with Autozone and Advance. Suggestions? Besides online?
NAPA carrys it here--I buy it by the case.
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Unread 04-29-2012, 07:00 PM   #3102
Rubi4MyMrs
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Are you sure O'reilly can't get it for you? I just saw it in one of their stores a couple days ago. I see it online on their site. I seem to remember it being higher price in the store. Here is a link:


http://www.oreillyauto.com/site/c/de...0425&ppt=C0162
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Unread 04-29-2012, 07:13 PM   #3103
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I hope O'reilly's can still get the VR1. That's where I got mine from the last time they put it on sale. They did have to order it from the warehouse though....they only carried the 20W-50 in the store. Like another poster said, NAPA can get it as well. Worst case, Amazon carries it and offers free shipping if memory serves.
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Unread 04-29-2012, 08:11 PM   #3104
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Last time I ordered a case on Amazon.
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Unread 04-29-2012, 08:58 PM   #3105
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A quick update, gentlemen.
I have fully disassembled a donated, damaged OPDA and was I ever shocked.
The construction of that thing is some of the worst engineering I have seen my last visit to NASA Glenn.
I have arrived at a reliable, simple solution using most of the OEM components, proper materials based on tribological needs, (unlike OEM cost accounting designs), and no need for oil cups, added oil lines, or any special service. In a short time, I'll be asking for volunteers to send me their OPDA's so I can modify them, and you guys can accumulate the mileage to assess the effectiveness of my design. If all goes as I expect, I can fix ALL of the OPDA's that were poorly designed and manufactured by Chrysler.
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