Transmission slipping already?!

[sootie]

How do I get to them?


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have a look here. this should be all you need.

http://powerstrokearmy.com/forums/showpost.php?p=698611&postcount=42

 

[Pwrcummins]

Easy. How would I figure out which one is bad? Ohm tester?


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[Atsah]

I would check the EPC/PC-A line pressure soleniod first with an ohm meter.. Make sure it's between 5.08 and 5.80 ohms..

 

[Pwrcummins]

K. Key on truck on or key on truck off?


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[Mark Kovalsky]

Key off truck off.

And that won't give you any information on whether or not the solenoid is sticking. There is no test for that, you have to determine that from the symptoms.

 

[Atsah]

Mark, does tuning/changing line pressure effect the line pressure solenoid negatively?

 

[Pwrcummins]

Gonna order the line pressure Solenoid. Hopefully that should work. The TC doesn't go out very often on these trucks do they?


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[Mark Kovalsky]

Mark, does tuning/changing line pressure effect the line pressure solenoid negatively?

No, it shouldn't. It can negatively affect the clutches, but not the solenoid.

Gonna order the line pressure Solenoid. Hopefully that should work. The TC doesn't go out very often on these trucks do they?

No.

 

[Pwrcummins]

Could the solenoid that controls line pressure also cause a feel of lost power?


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[Pwrcummins]

want to order an upgraded epc solenoid but not sure where to get it. im looking at mts diesel and they have a decent price on one. anywhere else i could get one. want to look at all options before i order.

 

[Mark Kovalsky]

Could the solenoid that controls line pressure also cause a feel of lost power?

I can't think of a way that it could do that.

want to order an upgraded epc solenoid but not sure where to get it. im looking at mts diesel and they have a decent price on one. anywhere else i could get one. want to look at all options before i order.

Please educate me. What does an upgraded EPC solenoid do for you? How is it better?

 

[Pwrcummins]

I don't know if there's an upgraded one. Prolly more updated I guess. Just been told that it's an upgrade


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[04cr450]

I would like to change what I said before- I had thought I changed out the line pressure control but did not(I did not pay attention to diagram close enough)... Tried to change the solenoid out today and was unsuccessful. I have no idea how to get the main wiring plug out to get the line solenoid out the body... Sorry, I had changed another solenoid apparently and it worked but just started acting up again-went to look into it further and cussed myself for an hour.
How do you get the line pressure solenoid out? I don't think you have to remove the solenoid body do u?

 

[Pwrcummins]

The the epc ( line pressure) solenoid the same thing as a direct pressure solenoid?


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[Mark Kovalsky]

The EPC solenoid is solenoid A, the direct clutch solenoid is solenoid D.

The connector should pull out of the trans. The o-ring that seals it often sticks, making it hard to pull out.

 

[Pwrcummins]

Seems like a simple task. I may try doing it tomorrow. How much fluid should I add back when I'm done?


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[04cr450]

Thanks mark for helping us.. it seems easy but that plug just won't come out... should u unbolt the plug that mounts to outside case of tranny?... just don't want to break anything

 

[Pwrcummins]

Had the truck looked at and they said the line pressure solenoid dropped to 170 psi and spiked up to 200psi. Is that bad?


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[Mark Kovalsky]

Seems like a simple task. I may try doing it tomorrow. How much fluid should I add back when I'm done?

Enough to fill it. Probably about 8 quarts.

Thanks mark for helping us.. it seems easy but that plug just won't come out... should u unbolt the plug that mounts to outside case of tranny?... just don't want to break anything

You can't get it out while the connector is plugged into the wiring harness.

Had the truck looked at and they said the line pressure solenoid dropped to 170 psi and spiked up to 200psi. Is that bad?

It is bad if the PCM didn't command that, it's normal if the PCM did command that. I can't see what the PCM is doing from here, that takes a high end scan tool that is looking at live data to determine what the PCM is commanding.

 

[Pwrcummins]

Well poop. I'm just change out the line pressure solenoid and see if that fixes it. I feel 85% positive that's it


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