|
|
SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS! |
Post Reply |
|
Thread Tools | Search this Thread |
07-02-2015, 12:01 PM | #1 |
Registered
1
Rep 2
Posts |
Possible Torque Converter (lock up clutch) problem ?
Hi!
This is my first post at forum . I have a 2003 Z4 3.0i M54 roadster . I bought my car last year in August and it was at 92.000kms with no problems. In winter my car started to make a thud in second gear ; very strong thud and rpm drop . (You can see it on a video , car is shaken at 3000rpms ! If the engine/tranny/fluids etc. are cold this happens at 2nd gear at 3000rpm . As the engine/tranny/fluids get warm up there is no thud at 2nd gear but there is always a rpm drop ! When engine/tranny/fluids are at normal operating temperature there is a rpm drop at 5th gear ; at 5th when you kicked the gas pedal a little it goes to 3000rpm and drops 250rpm . Sometimes it makes at 2750rpm . While lowering the gear from 5th to 4th there is a drop ( can't hold the rpms stable , and falls back 250rpm) There is no problem at kick down or no problem with 0-to xxkm acceleration. When I first experienced this I changed ignition coils and spark plugs ; btw there is no error code ! Changing these parts did not help . I flushed the ATF but no luck Actually I think this is related with torque converter ; I guess a worn lock up clutch ? I uploaded some videos . Videos about ; When the engine is cold a thud at 3000rpms at 2nd gear , When engine/tranny/fluids are at normal operating temperature there is no thud at 2nd gear (a night video) When engine/tranny/fluids are at normal operating temperature at 5th gear ( please ignore the temperature gauge because my thermostate was broken) And normal 0 to ... kms acceleration videos I don't want to change my TC for now because I don't use my BMW so much ; I drive it on weekends and in holidays. I consider to use Dr. Tranny Instant Shudder Fixx ; I bought from amazon ; customer reviews are positive. Thanks in advance |
07-02-2015, 12:11 PM | #2 |
Mechanical Engineer
96
Rep 1,025
Posts |
I would say that using any "transmission fix" product is rolling the dice, it might help, it might hurt, it might (probably) do nothing. I've used Lucas Oil Transmission Fix with good results on my gf's Chrysler. We traded it about 3 months later though so I can't say anything about longevity.
In general doing an ATF flush on a higher mileage transmission is more likely to cause problems than fix them, because all of the crud thats collected in the nooks and crannies can be washed back into the belts and gears. I don't know what to do after you've already done that though, maybe someone will post a recommendation. |
Appreciate
0
|
Post Reply |
Bookmarks |
|
|