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Trans Drainback Valve Problem
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=66004		 Page 1 of 1
Author:  DOC4444 [ Fri Mar 23, 2012 12:55 pm ]
Post subject:  Trans Drainback Valve Problem
We seem to be having the symptoms, intermittantly on startup, of the trans filter drainback valve sticking. We have OEM filters in place. Has anyone simply replaced the filters with OEM and had the problem go away?

Thanks,

DOC
Author:  msilbernagel [ Fri Mar 23, 2012 3:59 pm ]
Post subject:  Re: Trans Drainback Valve Problem
I'll let you know. The filters on ours were replaced on Wednesday. Previously, we'd been experiencing the problems:

->e.g. frequent delays going into gear at startup, esp when cold

->the occasional CEL if I didn't let it idle long enough before attempting to put it in drive and accelerate (after cold start)

->the occasional event where, when idling the transmission felt like the torque converter locked up and it became a manual transmission with no clutch...

The transmission shop did a reset and quick learn, along with replacing the filters and fluid.

Seem Ok so far - but one day in a row is too early to tell. Keep you posted.

Mark
Author:  geordi [ Fri Mar 23, 2012 9:28 pm ]
Post subject:  Trans Drainback Valve Problem
Mark, that is a lot more than just the drain back problem... You sure your trans had the right fluid before? The stalling when cold sounds about right, the manual-no-clutch... That's new to me, and I'm well familiar with the trans glitches.
Author:  msilbernagel [ Fri Mar 23, 2012 11:19 pm ]
Post subject:  Re: Trans Drainback Valve Problem
Well - I'm pretty sure it's got the right fluid now. 'Bob' (really) and I talked about that when I brought the rig in. I found a them (a well-rated/reviewed shop) on Angie's list and have been using them lately.

As for what was in there - I'd had the fluid flushed/changed some time ago at one of the fast oil-change places; it's possible they threw junk in there and started some of this..

That won't happen again. :wink:

The manual-no-clutch was someone else's description I'd read around here recently - I'd thought I was the only one. Now I think it's a quirk of our 545RFEs under certain circumstances. Don't know if it is drain back, poor ATF fluids, advancing age & wear, electrical glitches, or what. Whatever it is, I'll be glad if it stays away.

If we see a pattern with the other CRDs it would be nice to pin down the root cause and best fix.

geordi wrote:
Mark, that is a lot more than just the drain back problem... You sure your trans had the right fluid before? The stalling when cold sounds about right, the manual-no-clutch... That's new to me, and I'm well familiar with the trans glitches.
Author:  rossignol292 [ Tue Mar 27, 2012 2:01 am ]
Post subject:  Re: Trans Drainback Valve Problem
have you tried the FLCV mod? that seems to work pretty well.
Author:  flman [ Tue Mar 27, 2012 6:19 am ]
Post subject:  Re: Trans Drainback Valve Problem
msilbernagel wrote:
Well - I'm pretty sure it's got the right fluid now. 'Bob' (really) and I talked about that when I brought the rig in. I found a them (a well-rated/reviewed shop) on Angie's list and have been using them lately.

As for what was in there - I'd had the fluid flushed/changed some time ago at one of the fast oil-change places; it's possible they threw junk in there and started some of this..

That won't happen again. :wink:

The manual-no-clutch was someone else's description I'd read around here recently - I'd thought I was the only one. Now I think it's a quirk of our 545RFEs under certain circumstances. Don't know if it is drain back, poor ATF fluids, advancing age & wear, electrical glitches, or what. Whatever it is, I'll be glad if it stays away.

If we see a pattern with the other CRDs it would be nice to pin down the root cause and best fix.

geordi wrote:
Mark, that is a lot more than just the drain back problem... You sure your trans had the right fluid before? The stalling when cold sounds about right, the manual-no-clutch... That's new to me, and I'm well familiar with the trans glitches.


X2 on the fluid, I have 2 Jeeps that even with my check valve mod would do the following, poor initial engagement and locking up and stalling the engine. I had Amsoil ATF and Dr. Tranny Instant Shudder Fixx in both of them. The ATF+4 is what fixed it for me.

Mine were both never right after I did a fluid change with Amsoil.
Author:  geordi [ Tue Mar 27, 2012 12:00 pm ]
Post subject:  Re: Trans Drainback Valve Problem
This is interesting information about the Amsoil transmission fluid, I read somewhere recently about another brand having major problems and saying that you cannot use amsoil in their transmissions. Since I have been reading a lot more recently about VW diesels again, I wonder if it was theirs.

Either way, transmissions are somewhat magic to me. I know power goes in and lots more comes out, and the very basic theory of operation... But that is it. So in that respect, I am quite happy to stick with ATF+4 in a full synthetic (usually Castrol from the parts place) and if a bottle of Lucas keeps it slimy enough that I don't have the drainback problem... Well, I have never had a problem with engine or transmission or power steering while using Lucas. The stuff is thick bear snot, but it works great.
Author:  EAB [ Sun Apr 01, 2012 4:33 pm ]
Post subject:  Re: Trans Drainback Valve Problem
msilbernagel wrote:
I'll let you know. The filters on ours were replaced on Wednesday. Previously, we'd been experiencing the problems:

->e.g. frequent delays going into gear at startup, esp when cold

->the occasional CEL if I didn't let it idle long enough before attempting to put it in drive and accelerate (after cold start)

->the occasional event where, when idling the transmission felt like the torque converter locked up and it became a manual transmission with no clutch...

The transmission shop did a reset and quick learn, along with replacing the filters and fluid.

Seem Ok so far - but one day in a row is too early to tell. Keep you posted.

Mark


Any update? I've had the above happen once recently. I've only had the Jeep running for about 800 miles so I'm not sure of the fluid type.
Author:  msilbernagel [ Sun Apr 01, 2012 7:39 pm ]
Post subject:  Re: Trans Drainback Valve Problem
EAB wrote:
msilbernagel wrote:
I'll let you know. The filters on ours were replaced on Wednesday. Previously, we'd been experiencing the problems:

->e.g. frequent delays going into gear at startup, esp when cold

->the occasional CEL if I didn't let it idle long enough before attempting to put it in drive and accelerate (after cold start)

->the occasional event where, when idling the transmission felt like the torque converter locked up and it became a manual transmission with no clutch...

The transmission shop did a reset and quick learn, along with replacing the filters and fluid.

Seem Ok so far - but one day in a row is too early to tell. Keep you posted.

Mark


Any update? I've had the above happen once recently. I've only had the Jeep running for about 800 miles so I'm not sure of the fluid type.


Still working flawlessly - my daughter's been daily driving it 30+ miles (one way) to work in Portland. Been what, several weeks now?

All while I'm doing the timing belt, pump, idler, belts, hoses, and putting a collar in to repair a stripped oil-pan threads in an aluminum oil pan.. on her Dodge. :wink:

She gets it back tomorrow - and I get the little tractor! :JEEPIN:

Mark
Author:  papaindigo [ Mon Apr 02, 2012 7:40 am ]
Post subject:  Re: Trans Drainback Valve Problem
If you "think" you have the drainback problem there is sure diagnosis and temporary (been working for me for 18Kmiles) fix. When you first crank up the vehicle after it has been sitting for over 4-8 hours (drainback seems to take overnight or a full workday) immediately shift to Neutral, of course with your foot on the brake, and run the idle up to 1,500rpm for ca. 15-30 seconds, drop to idle, shift into gear and drive off. If the problem never reappears you have found the cause.

It's important to do this in neutral not park as the 545RFE either does not pump or does not pump much fluid in park. Don't ask me, that's what I've found and the FSM does mention different pumping rates.

Oddly the problem appears to be most apparent in drive not reverse. On occasion when I forget to do the drill I've backed out of the driveway and shifted into drive at which point there is no feel that the tranny has engaged and the vehicle won't move. If that happens IMMEDIATELY shift into neutral and run the above drill; again you have found the cause. I say immediately because if you try to gun the engine and drive off you will experience sluggish gear engagement, go about 100', likely suffer a really spectacular engine stall after which everything runs fine except 50% of the time there will be a CEL that takes about 5 good crank/drive cycles to clear.

Yes I know I should get the tranny serviced to fix this but the above trick works fine and I've been holding off for a 50K tranny service or new torque convertor whichever comes first. Looks like TC wins.
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