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Alright guys, I went for a nice drive today to figure out what I got going on. After about 20 minutes the EPC stuck on me (see image). I was able to get it to clear by pulling over and shutting the truck off and starting back up. As far as the readings of EPC and line pressure, they seemed very steady together until the EPC stuck. So I believe EPC is bad along with a possible valve? Just don’t know which in to look at.
Stuck at a low reading and I’m at a stop. Pressure was very low at the stop, but when I got going, pressure was very high and shifts were harsh.
Are there any trouble codes stored? From your pic and with very little information it looks like the trans went into limp mode. If you want to replace a valve replace the actuator feed limit valve with this one from Central Valve Bodies.
4L60E-AFL oversize drop in AFL valve.
Are there any trouble codes stored? From your pic and with very little information it looks like the trans went into limp mode. If you want to replace a valve replace the actuator feed limit valve with this one from Central Valve Bodies.
4L60E-AFL oversize drop in AFL valve.
I got p1870 when that happened. “Transmission component slipping” first time I’ve seen it. I was wondering AFL valve, but didn’t know if they made one oversized and drop in. Thank you, I will get that ordered.
Just grabbing at straws but maybe a TransGo oversize Drop-in Pressure Regulator Valve part # 4L60E-PR.
I have a local guy that will sell me that PR valve. I will get this stuff done on wednesday while im off work if that AFL valve is in. Is there anything electrical I should look at just to make sure?
When you say it sounds like its going into limp mode, I still have all gears it seems, so not sure if it is limp or not.
It may not be limp mode but the codes at that time most likely caused the high line pressure. I never did see the info on what the EPC is doing when the line pressure is low. I need to know what the ECP amps are when the line pressure is low (like 50PSI for example). Until then all I can do is guess.
It may not be limp mode but the codes at that time most likely caused the high line pressure. I never did see the info on what the EPC is doing when the line pressure is low. I need to know what the ECP amps are when the line pressure is low (like 50PSI for example). Until then all I can do is guess.
Example
Amps 1.0 50 PSI
Amps .89 63PSI
The PSI was around 30 when the EPC was locked at .14 and when I accelerated it jumped to 150 and looked unstable.
At .14 the line should be closer the max line pressure. With a .14 The EPC is being commanded to rase the pressure but it not rising until you add more RPM. What this tells me is that the EPC cannot control the pressure. Now why is the question, is it because of a bad EPC solenoid? You have had two EPC that are doing the same thing. Or is it because of a worn AFL or Pressure Regulator valve? I am thinking the problem is with the AFL valve. I am about at the end of my knowledge hopefully someone who understands the hydraulics better like @vorteciroc or @MaroonMonsterLS1 can verify if we are on the right track.
At .14 the line should be closer the max line pressure. With a .14 The EPC is being commanded to rase the pressure but it not rising until you add more RPM. What this tells me is that the EPC cannot control the pressure. Now why is the question, is it because of a bad EPC solenoid? You have had two EPC that are doing the same thing. Or is it because of a worn AFL or Pressure Regulator valve? I am thinking the problem is with the AFL valve. I am about at the end of my knowledge hopefully someone who understands the hydraulics better like @vorteciroc or @MaroonMonsterLS1 can verify if we are on the right track.
I really appreciate everything you have contributed so far man. I'm learning a lot thanks to you guys. I hope to come to a conclusion soon so you know what it was. Also, apologies for not having as much info that would be needed to diagnose better. I'm limited on what I own for trans work.
I have Sonnax pinless accumulators coming int the mail tomorrow. I will have the "gently overside AFL valve" on wednesday to thursday. I am also getting the OS drop in transgo PR valve and a used valve body from a local shop on wednesday. I will have all the work done on thursday and tested that evening. If the VB I have currently doesnt show to be any help, I will swap with the used I am buying to see if it helps at all.
Alright guys, I have a second valve body to play around with. Took my whole valve body apart and go all the parts separated into baggies with correct labels. I’m taking apart the new one I bought. It looks like it has been rebuilt before due to an aluminum accumulator piston. I got the converter clutch regulator out, but it doesn’t match what I have in my documents. I am attaching an image of the document I’m using and what was pulled out.
One long valve, no spring. My VB has what looks like a Sonnax valve with a spring. Any thoughts on this?
Awesome thanks. I’m debating on trying to use this VB instead of the one I have. Go through it and replace springs and valve that look worn with ones that look new/better in mine. I will be getting the PR valve and that AFL valve tomorrow and hopefully put back together by noon.
So whats your grand scheme of things here with this valve body?
I was comparing everything to the one I had. I used the aluminum accumulator out of it as well as the EPC. It is an earlier style VB, so I decided not to use it due to two differences in vent holes (3-2 and manual drive vents). The PR valve is transgo drop in style and the gently oversized AFL valve are now installed. I have to fill it back up and finish welding my exhaust back up (different project). Then I’ll know what happens.
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