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Old 10-31-2003, 12:45 AM
Registered User
Join Date: Oct 2003
Posts: 122
Lock-up Torque Converter

Hi everibody,
thanks to all because i like this forum very much.
I have a CLK 430 1998 and i am not sure if the LOCK-UP is working or not.
I mean that i do not know if my car is provided of a converter with a lock -up converter that is engaged on on 5th .
I am asking this because i know that soem cars has this sstem and you can really FEEL when the converter is locked or not.
when i drive my car even after some minutes at the same speed in 5th i do not feel if the converter is locked or not.
thanks a lot to all that will help me
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Old 10-31-2003, 08:27 AM
Registered User
Join Date: May 2003
Location: DC Metro Area
Posts: 365
Vary the throttle in 5th

Try varying the throttle while in 5th gear - but not enough to kickdown into the next lower gear. If your converter is truly locked in 5th, there should be no RPM change except if your speed changes. Without lockup - your RPM will fall slightly if you let off the gas, and increase if you apply more gas.

Hope this helps.

1995 E420 71k
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Old 10-31-2003, 02:42 PM
Ali Al-Chalabi's Avatar
Senior Member
Join Date: Nov 2000
Location: Knoxville, TN
Posts: 1,837
Your car is equipped with a lockup torque converter clutch with computer controlled slip.

Not sure how it is on your car, but under steady road speeds in my C280, there will be about 60 rpms of slip at 35 mph. Gradually, as the road speed increases the amount of slip will decrease. There are about 25 rpms of slip at 55 mph and it is fully locked with no slip by about 65 mph.

Thsi is to isolate any torsional vibrations from the driveline at lower engine and road speeds. The lockup clutch applies very, very smoothly, it will be difficult to see an instant lock and unlock at highway speeds.
Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record
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Old 11-01-2003, 08:45 AM
Registered User
Join Date: Oct 2003
Posts: 122
Thanks a lot my car run as you describe.
I like this forum
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