CleanIsFast Journal: BMW X5 4.6iS

[bcredliner]

Engine or transmission problems that aren't corrected quite often lead to much more costly issues. I would visit a well recommended independent transmission shop familiar with BMW transmission for a diagnosis.

[CleanIsFast]

Originally Posted by X53Jay4.8is

When you changed your trans fluid you used about 7 liters? I recall that when I did the flush on mine it was close to 13L due to the TC.

Yes it took a lot, at least 7L to 8L

[CleanIsFast]

It's just very hard to pinpoint what is exactly wrong. Some people say a fluid/filter changed cured, others say wire harness replacement, solenoids, complete torque converter replacement, complete transmission replacement, valve body megatronic, aftermarket oil coolers, etc

Most people just replace the entire transmission because it has new components of everything listed above (minus the aftermarket cooler). Pay once and it's all over with or risk trying to replace one item and hope for the best. It's tough because you have to pretty much drain the fluid out to do anything, and the fluid is expensive as-is.

[sunny5280]

Originally Posted by CleanIsFast

It's just very hard to pinpoint what is exactly wrong. Some people say a fluid/filter changed cured, others say wire harness replacement, solenoids, complete torque converter replacement, complete transmission replacement, valve body megatronic, aftermarket oil coolers, etc

Most people just replace the entire transmission because it has new components of everything listed above (minus the aftermarket cooler). Pay once and it's all over with or risk trying to replace one item and hope for the best. It's tough because you have to pretty much drain the fluid out to do anything, and the fluid is expensive as-is.

I'm surprised that after all of these years and the number of occurrences that a common cause has not been identified. Surely this one problem can't be problems which were addressed by these fixes.

[bcredliner]

Might try to PM to RRPhil. I think he is the best here as it relates to transmission problems.

[X53Jay4.8is]

Originally Posted by bcredliner

Might try to PM to RRPhil. I think he is the best here as it relates to transmission problems.

Yes RRPhil would be the best resource especially on the rebuild side. Pitty he is not in the US

[CleanIsFast]

Yesterday I took the 4.6 for a nice long (& spirited drive). What a machine....I eventually tried sport mode with manual shifting. This is the first time I've summed up the courage to try the manual shifting and to my surprise, it shifted flawless with no slipping, noises, etc from 1-2-3-4-5 and back down. Wondering If I just drive this way all the time and when coming to a stop just leave it in 2nd and see if the downshift lurch stays away.

[X53Jay4.8is]

Originally Posted by CleanIsFast

Yesterday I took the 4.6 for a nice long (& spirited drive). What a machine....I eventually tried sport mode with manual shifting. This is the first time I've summed up the courage to try the manual shifting and to my surprise, it shifted flawless with no slipping, noises, etc from 1-2-3-4-5 and back down. Wondering If I just drive this way all the time and when coming to a stop just leave it in 2nd and see if the downshift lurch stays away.

At some point that Tranny will have to to come down to address its problems. But until then enjoy it in sport mode.

[CleanIsFast]

Does anyone know if the oil temp on the cluster is in *F while everything else is in *C? I was curious to see at what temperature the 2-1 lurch occurs and usually it's right before dead center (or "normal operating temperature"). But when I looked at the secret menu option #16 it's saying OELTEMP: 93*C? Why would the cluster say almost 210 (center). I did the conversion from *C to *F and it's pretty damn close which leads me to believe the cluster is in *F for oil temp.

[bcredliner]

Originally Posted by CleanIsFast

Does anyone know if the oil temp on the cluster is in *F while everything else is in *C? I was curious to see at what temperature the 2-1 lurch occurs and usually it's right before dead center (or "normal operating temperature"). But when I looked at the secret menu option #16 it's saying OELTEMP: 93*C? Why would the cluster say almost 210 (center). I did the conversion from *C to *F and it's pretty damn close which leads me to believe the cluster is in *F for oil temp.

Cluster is Fahrenheit. Don't know for sure why the conversion, have assumed it is converted in cluster for US vehicles.