4L60E why the low pressure hot?
Thread Starter
Teching In
Joined: Nov 2014
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From: Finland
4L60E why the low pressure hot? Transmission 4l 60e oil pressure test. When cold it's ok but when it's hot, pressures drops too much.
electrical pin is out Pressure control valve, so full of fishing.
Just came from workshop, all Sonnax $$$$ : Bang:
electrical pin is out Pressure control valve, so full of fishing.
Just came from workshop, all Sonnax $$$$ : Bang:
Last edited by mrvedit; Apr 2, 2015 at 10:35 AM. Reason: Fix title
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From: Ann Arbor, MI
Your cold pressure is too high. I've been told that max pressure should be between 225 and 240, no higher or seals can blow out.
With a .500/.490 boost valve installed I usually see 225 when I blip the throttle.
So you seem to be too high when cold. Your hot pressures are a bit low for a stock trans and a moderately low if a bigger boost valve was installed.
For ATF, are you running Dex 3 or 6, or something else?
With a .500/.490 boost valve installed I usually see 225 when I blip the throttle.
So you seem to be too high when cold. Your hot pressures are a bit low for a stock trans and a moderately low if a bigger boost valve was installed.
For ATF, are you running Dex 3 or 6, or something else?
Thread Starter
Teching In
Joined: Nov 2014
Posts: 11
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From: Finland
Your cold pressure is too high. I've been told that max pressure should be between 225 and 240, no higher or seals can blow out.
With a .500/.490 boost valve installed I usually see 225 when I blip the throttle.
So you seem to be too high when cold. Your hot pressures are a bit low for a stock trans and a moderately low if a bigger boost valve was installed.
For ATF, are you running Dex 3 or 6, or something else?
With a .500/.490 boost valve installed I usually see 225 when I blip the throttle.
So you seem to be too high when cold. Your hot pressures are a bit low for a stock trans and a moderately low if a bigger boost valve was installed.
For ATF, are you running Dex 3 or 6, or something else?
I did the pressure test with air ... like this.
TECH Junkie
Joined: May 2012
Posts: 3,051
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From: Poplarville, MS
Your air test isn’t doing anything except blowing oil out of the passages. You need to hook a scanner up to the car and check for trouble codes. Also check the EPC solenoid for proper function hot and cold.
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Joined: Aug 2010
Posts: 7,323
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From: Ann Arbor, MI
Yeah, no idea what that air test would accomplish.
When you say "cold", how cold do you mean? Since you are in Finland, perhaps your idea of cold is very cold. If the high pressure is only when it is very cold out , e.g. -15C or below, I would simply let the car warm up a bit so that trans pressure is never more than 250.
When you say "cold", how cold do you mean? Since you are in Finland, perhaps your idea of cold is very cold. If the high pressure is only when it is very cold out , e.g. -15C or below, I would simply let the car warm up a bit so that trans pressure is never more than 250.
Thread Starter
Teching In
Joined: Nov 2014
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From: Finland
I scanned the fault codes and no one was found. I ordered a new EPC solenoid, because I doubt that too. I'll replace all the solenoids with new ones because they are sensitive components.
"Cold " is about 15 celsius ( 60f ) in my garage.
Finnish summer temperature is about ~ 15-30 celsius ( 60f - 86F )
when I use this car .
Yes, car is always needed to warm up before it can be ready for cruising.
The air test tells that when the pressure line " drops down " between the pump and the shell, maybe the oil escapes from there ... warm flexibly?
I am afraid that something from pump has been forgotten, or some part is missed from inside the pump. The lack of a nylon filter could be causing this and mess the pressure too. This problem started in after gearbox maintenance, where
was added for example Sonnax Smart -Tech input input kit.
Would be a huge job to take down the gearbox. So that's why I've been thinking, should I do it.
"Cold " is about 15 celsius ( 60f ) in my garage.
Finnish summer temperature is about ~ 15-30 celsius ( 60f - 86F )
when I use this car .
Yes, car is always needed to warm up before it can be ready for cruising.
The air test tells that when the pressure line " drops down " between the pump and the shell, maybe the oil escapes from there ... warm flexibly?
I am afraid that something from pump has been forgotten, or some part is missed from inside the pump. The lack of a nylon filter could be causing this and mess the pressure too. This problem started in after gearbox maintenance, where
was added for example Sonnax Smart -Tech input input kit.
Would be a huge job to take down the gearbox. So that's why I've been thinking, should I do it.
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Joined: Aug 2010
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From: Ann Arbor, MI
I have been told by a pro trans builder that if that yellow filter is left out of the pump (by mistake) that pressure will be extremely low.
In your (unusual) air test it was interesting to see the fluid escape by the boost valve. That is why I suggest the Sonnax boost valve over the Transgo one - the Sonnax has two o-rings which eliminate this leakage and therefore might have better and higher pressure regulation.
Installing a new EPS sounds like a good idea.
So, the trans was recently rebuilt? Exactly what aftermarket/performance parts were installed?
In your (unusual) air test it was interesting to see the fluid escape by the boost valve. That is why I suggest the Sonnax boost valve over the Transgo one - the Sonnax has two o-rings which eliminate this leakage and therefore might have better and higher pressure regulation.
Installing a new EPS sounds like a good idea.
So, the trans was recently rebuilt? Exactly what aftermarket/performance parts were installed?
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Thread Starter
Teching In
Joined: Nov 2014
Posts: 11
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From: Finland
I have been told by a pro trans builder that if that yellow filter is left out of the pump (by mistake) that pressure will be extremely low.
In your (unusual) air test it was interesting to see the fluid escape by the boost valve. That is why I suggest the Sonnax boost valve over the Transgo one - the Sonnax has two o-rings which eliminate this leakage and therefore might have better and higher pressure regulation.
Installing a new EPS sounds like a good idea.
So, the trans was recently rebuilt? Exactly what aftermarket/performance parts were installed?
In your (unusual) air test it was interesting to see the fluid escape by the boost valve. That is why I suggest the Sonnax boost valve over the Transgo one - the Sonnax has two o-rings which eliminate this leakage and therefore might have better and higher pressure regulation.
Installing a new EPS sounds like a good idea.
So, the trans was recently rebuilt? Exactly what aftermarket/performance parts were installed?
trans was recently renovated , performance parts installed .
I use the air often many tests , it is much easier .
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Teching In
Joined: Nov 2014
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From: Finland
The transmission has been taken out of the car.
Yes, the filter was missed from the pump, now in the air test there was no leaks. Great work for a such little thing.
Now look like this, that you should measure the line pressures sometimes, and then you'll ease your life. They are important for the transmission duration.
Yes, the filter was missed from the pump, now in the air test there was no leaks. Great work for a such little thing.
Now look like this, that you should measure the line pressures sometimes, and then you'll ease your life. They are important for the transmission duration.
On The Tree
Joined: Feb 2011
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Morjesta vaan Reka.
I had some shifting problems too and i took my own rebuilt tranny apart because of slipping 2 to 3 gear. Didnt found anything special but only leaking reverse/boost valve.
Do you really have o-ring Reverse/boost valve?
Because i had very similar leak like in your video and i changed to o-ring model and air leak was totally gone.
My tranny is just about to go back in car so no real time results yet with my new reverse/boost valve.
Where do you live?
If my problem continues i could use a little help with your HP tuners if you will.
I had some shifting problems too and i took my own rebuilt tranny apart because of slipping 2 to 3 gear. Didnt found anything special but only leaking reverse/boost valve.
Do you really have o-ring Reverse/boost valve?
Because i had very similar leak like in your video and i changed to o-ring model and air leak was totally gone.
My tranny is just about to go back in car so no real time results yet with my new reverse/boost valve.
Where do you live?
If my problem continues i could use a little help with your HP tuners if you will.
Thread Starter
Teching In
Joined: Nov 2014
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From: Finland
Hey , good to find out that you got a leak, it's probably okay.
Yes , in my car it leaked between trans- case and pump case .
Low pressure mess with th whole box functions .
I hope these videos will help to someone ?
And I live in central Finland (Europe)
On The Tree
Joined: Feb 2011
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I live in south, so not much help with your HP to me then. I propably by my own HP soon and have wideband lambda to lean out my fuel tune.
I have TSP tune and its very rich. It hardly stays on idle. Lambdas were also quite black when i disassebled them. I have heard with other people too here in Finland that US tune is too rich to our fuel here.
I have TSP tune and its very rich. It hardly stays on idle. Lambdas were also quite black when i disassebled them. I have heard with other people too here in Finland that US tune is too rich to our fuel here.
Thread Starter
Teching In
Joined: Nov 2014
Posts: 11
Likes: 0
From: Finland
I live in south, so not much help with your HP to me then. I propably by my own HP soon and have wideband lambda to lean out my fuel tune.
I have TSP tune and its very rich. It hardly stays on idle. Lambdas were also quite black when i disassebled them. I have heard with other people too here in Finland that US tune is too rich to our fuel here.
I have TSP tune and its very rich. It hardly stays on idle. Lambdas were also quite black when i disassebled them. I have heard with other people too here in Finland that US tune is too rich to our fuel here.
Last edited by Reka; Jun 30, 2015 at 03:12 PM.