RPM at highway speeds? E500
#1
Junior Member
Thread Starter
RPM at highway speeds? E500
Just curious what any of you see at highway speed in D. I'm thinking I'm not getting the torque convertor to lock up, as the RPMs seem high. At 55MPH, I see about 2k RPM, at 80 MPH, I see 2750 RPM. This seems high for a V8.
I just did a tranny fluid and filter swap, which eliminated the shift shudder I was experiencing, but I'm wondering if there's more to chase. Does the TC lock up and drop revs at higher speeds?
5 spd automatic, BTW. 2004 E500 4matic wagon.
I just did a tranny fluid and filter swap, which eliminated the shift shudder I was experiencing, but I'm wondering if there's more to chase. Does the TC lock up and drop revs at higher speeds?
5 spd automatic, BTW. 2004 E500 4matic wagon.
#5
Junior Member
Thread Starter
Hmmm, sounds like I may have something not quite sorted, then. I have the 5 spd auto, and at 80 MPH, I see much higher revs.
Possible causes?
I've read a bit about the convertor lock up solenoid going flaky with contaminated/dirty Trans fluid. Could it also possibly be a conductor plate issue?
I was having shift shudder issues, which seemed to have gone away with a fluid/filter change. I'm wondering if I should swap out another 4 qts of fluid and see if things improve?
Possible causes?
I've read a bit about the convertor lock up solenoid going flaky with contaminated/dirty Trans fluid. Could it also possibly be a conductor plate issue?
I was having shift shudder issues, which seemed to have gone away with a fluid/filter change. I'm wondering if I should swap out another 4 qts of fluid and see if things improve?
#6
MBWorld Fanatic!
shoulda probably just replaced the conductor plate while the pan was off. those are plug and play and require no programming. My guess is useless though with out the correct diagnosis tree performed...
#7
Junior Member
Thread Starter
well, pan drop is less expensive than replacing the plate, and since it wasn't exhibiting any other conductor plate symptoms, I thought it would be worth a shot on the fluid/filter swap first. Unless the TC has a dedicated solenoid that is kaput, but I doubt one would fail without the others showing signs of trouble as well.
Ah, well, a bit more research to do. It definitely sounds like something isn't kicking in at speed.
Ah, well, a bit more research to do. It definitely sounds like something isn't kicking in at speed.