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Old 11-02-2010, 11:34 AM
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4L60E TCC Slipping when cold only

I have a 4L60E transmission in a 1997 Blazer whichs has following symptoms.
It has 110k mls on the clock.

The torque converter slippes when transmission is cold between 1500rpm and 1900rpm at 40 to 50mls.
Than when I start the truck after parking for couple hours it takes a while until the gear goes in. No torque applies.

Are these failures familiar.
I am located in Germany and have limited sources on good tranny technicians. So I have to do the failure anlayses on DIY and hope I can participate on existing experience.

What do you think!

BR Bob

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Old 11-02-2010, 10:17 PM
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Is the fluid level correct?

How do you know the converter is slipping?

Is the check- engine lite illuminated?

Trouble codes pulled ( If any)
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Old 11-03-2010, 01:59 AM
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I will look today for error codes.
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Old 11-03-2010, 02:32 AM
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Quote:
Originally Posted by monette999
I will look today for error codes.

Hi. Did you find some errors on it?
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Old 11-03-2010, 05:19 AM
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Hi I was scanning with the Tech2 today and found no trouble codes present or stored.


When there is no code I assume it is mechanical or getting wrong signals AS INPUT.

What can be the root cause for the downshift?

BR
Bob
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Old 11-03-2010, 05:31 AM
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Here the flow diagram of all modes of the 4L60E
Attached Files
File Type: pdf Fourth Gear with TCC applied.pdf (227.1 KB, 102 views)
File Type: pdf fourth gear..pdf (230.2 KB, 78 views)
File Type: pdf third gear..pdf (239.1 KB, 74 views)
File Type: pdf second gear..pdf (236.8 KB, 80 views)
File Type: pdf first gear. pdf.pdf (237.9 KB, 97 views)
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Old 11-03-2010, 06:51 AM
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If the TCC is slipping as you describe, then a trouble code would be present..

most common code set for TCC slippage is P1870 in that model vehicle.

Often that can be corrected with a TransGo kit and removal of the valve body for kit install.

IF the converter clutch is good shape , you may be OK with the kit install.... if the converter clutch material is damaged, then replacement converter is needed and perhaps more parts if the trnas is full of debris
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Old 11-03-2010, 11:47 AM
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what can cause also a downshift when it is cold.

A worn out throttle potimeter,
Or a bad cold start rpm solenoid?

Help.
Thanks for good advice in advance!
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Old 11-03-2010, 07:37 PM
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Quote:
Originally Posted by monette999
what can cause also a downshift when it is cold.

A worn out throttle potimeter,
Or a bad cold start rpm solenoid?

Help.
Thanks for good advice in advance!

Down shift from what gear to ? .

Vehicle speed? On a Hill ?

Constant throttle and the trans down shifts for no reason?

You have a Tech 2 Scanner? What does it tell you? Live data stream scans?
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Old 11-04-2010, 01:05 AM
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Hello, thank you for the help,
I have a tech2 which I can borrow, but I am not the expert with this scan tool.
But I realized that my cold start unit is part of the problem. I saw on idle that I have a strong rpm ramp up and down. This also happens when I drive about 55mls and I can see it shifts down. 2100 rpm to 2900 rpm is a full shift.

Can you explain to me how this automatic cold start works. It looks like it fugdes my imput signal and is the root cause for this behavor.

Hopefully you can give me good advice to fix this issue.

BR
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Old 11-04-2010, 10:14 AM
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Quote:
Originally Posted by monette999
I have a 4L60E transmission in a 1997 Blazer whichs has following symptoms.
It has 110k mls on the clock.

The torque converter slippes when transmission is cold between 1500rpm and 1900rpm at 40 to 50mls.
Than when I start the truck after parking for couple hours it takes a while until the gear goes in. No torque applies.

Are these failures familiar.
I am located in Germany and have limited sources on good tranny technicians. So I have to do the failure anlayses on DIY and hope I can participate on existing experience.

What do you think!

BR Bob
The 4L60E sometimes has problems with the temperature sensitive grounding switch that completes the circuit for torque converter lockup. If the switch fails open you will not get lock up nor will you get a code as the computer has signaled for lock up but does not check the ground side circuit to verify lock up is electrically possible. Often this switch partially or intermittently fails based upon the temperature of the transmission oil at the time of normal lock up. If the oil is under 160 degrees F and road speed exceeds 45 MPH the switch is open and the command signal does not achieve ground thus no lock up. If the trans oil is higher than 160 before the computer commands lock up at about 45 MPH then often, but not always, the switch will work and ground the command signal achieving lock up.

A good, but not fool proof, test is to get the engine and tranny warmed up at speeds under 40 MPH then once warmed go above 45MPH and see if it locks the converter. You should see about a 200-300 RPM reduction in engine RPM for the road speed when the TCC locks.

Bogie
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Old 11-12-2010, 01:38 AM
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today I got an failure code present.

P1870 TRANSMIISION COMPONMENT SLIPPING:

Does it means all problems with the shifting were realted to the failure code which was set?

BR
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Old 11-12-2010, 01:54 AM
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Quote:
Originally Posted by Crosley
If the TCC is slipping as you describe, then a trouble code would be present..

most common code set for TCC slippage is P1870 in that model vehicle.

Often that can be corrected with a TransGo kit and removal of the valve body for kit install.

IF the converter clutch is good shape , you may be OK with the kit install.... if the converter clutch material is damaged, then replacement converter is needed and perhaps more parts if the trnas is full of debris
Hello Crosley now I have a P1870 Stored. Where can I buy a TransGo kit.
BR bob
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Old 11-12-2010, 04:20 PM
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http://www.transgo.com/A1_4L60E-4L65E.html

http://www.transgo.com/distributors.php
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Old 11-14-2010, 12:54 AM
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Transgo good for code... Not so good on apply piston in converter Am Sonnax bias though... Am I clear? <vbg>
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