CleanIsFast Journal: BMW X5 4.6iS

[X53Jay4.8is]

Originally Posted by CleanIsFast

PM me

I thought we came to the conclusion that this mod (dinan CAI) is worthy of your X5? I am getting Dinan stage3 and auto trans software on Monday.

[CleanIsFast]

P0741 came back this morning on my way to work. This is only the 2nd time it's happened and I started to notice when it occurs. It only triggers if I am going uphill (or an incline), and I let off the gas? If I let off for a second or two it's fine, but anything longer it triggering the torque converter code. Transmission shifts very well in my opinion, up and down. Only time it doesn't is 2-1 downshift at a light or stop sign when temps are at 210* (dead center). Anything prior to normal operating temperature and the 2-1 lurch is not there at all. I've learned to coast to the stop sign (or light) with light brake pressure to get from 3-2, 2-1 and it helps a little. Still looking to do a transmission service (fluid, filter, pan gasket). I'd really like to do it myself since it seems fairly straight forward and I assume that there is enough clearance for me to just get underneath the vehicle without lifting it (even though that would be a lot easier). I guess I need to invest in some jack stands. Funny, I called my local stealership and they said "We will not perform that service on automatic transmissions. It is lifetime..." Even if the customer wants it done.

[bcredliner]

I wouldn't even try without jack stands. If you buy jack stands look for long version from craftsman and then a floor jack at some point that will raise it up that high.

I suggest checking the pan temp when you experience the problem to see if it is in normal range. Overheating can cause trans to do weird stuff. Laser temp readers are one of those tools you won't need often but is important and justified as a small reduction in the labor cost you are saving because you DIY.

You may have a problem with the internal heat sensor which is built into the wiring harness that you can replace when you have the pan off.

[CleanIsFast]

Originally Posted by bcredliner

I wouldn't even try without jack stands. If you buy jack stands look for long version from craftsman and then a floor jack at some point that will raise it up that high.

I suggest checking the pan temp when you experience the problem to see if it is in normal range. Overheating can cause trans to do weird stuff. Laser temp readers are one of those tools you won't need often but is important and justified as a small reduction in the labor cost you are saving because you DIY.

You may have a problem with the internal heat sensor which is built into the wiring harness that you can replace when you have the pan off.

If the heat sensor was bad, wouldn't the temp read differently on the cluster?

[bcredliner]

Coolant temp can normal and trans oil temp too high. Heat sensor in trans or trans cooler can be be malfunctioning and coolant temp fine.

[dannyzabolotny]

This isn't a Range Rover, there's not THAT much clearance under the X5. You'll need to buy 4 jack stands so you can lift up the X5 evenly. That's the other important thing to note— the vehicle has to be level to do the fluid service correctly.

[CleanIsFast]

Originally Posted by bcredliner

Coolant temp can normal and trans oil temp too high. Heat sensor in trans or trans cooler can be be malfunctioning and coolant temp fine.

Interesting, i'll have to investigate. Makes sense because anything prior to 210* on the cluster, it shifts great. But if this is the case, the fluid will still need to be replaced because it's probably getting burnt

Originally Posted by dannyzabolotny

This isn't a Range Rover, there's not THAT much clearance under the X5. You'll need to buy 4 jack stands so you can lift up the X5 evenly. That's the other important thing to note— the vehicle has to be level to do the fluid service correctly.

Looks like my next purchase

[CleanIsFast]

Update: 02.08.17 - Transmission Service

New transmission filter, seals, pan gasket
It took 7 liters!
Shifts great. I'll report back on the 2-1 downshift, I haven't driven it far enough to get up to normal operating temperature.


Upcoming Maintenance:
[X] Brand new Continental DWS06 Tires 275/315
[X] Intake Filter replacement
[X] Oil Service
[X] Spark Plugs
[X] Ignition Coils + Boots
[X] DINAN Transmission Software
[X] Rear trunk deck lid lense
[X] Automatic trunk open springs
[X] Transmission Fluid service
[ ] Valve Cover Gasket Replacement
[ ] Replace wheel cap roundels - updated version
[ ] Full Paint Correction - Spring 2017
[ ] Headlight restoration - Spring 2017

[StephenVA]

[smokeyyank]

Originally Posted by CleanIsFast

Update: 02.08.17 - Transmission Service

New transmission filter, seals, pan gasket
It took 7 liters!
Shifts great. I'll report back on the 2-1 downshift, I haven't driven it far enough to get up to normal operating temperature.


Upcoming Maintenance:
[X] Brand new Continental DWS06 Tires 275/315
[X] Intake Filter replacement
[X] Oil Service
[X] Spark Plugs
[X] Ignition Coils + Boots
[X] DINAN Transmission Software
[X] Rear trunk deck lid lense
[X] Automatic trunk open springs
[X] Transmission Fluid service
[ ] Valve Cover Gasket Replacement
[ ] Replace wheel cap roundels - updated version
[ ] Full Paint Correction - Spring 2017
[ ] Headlight restoration - Spring 2017

I'll be interested to hear how that works out for you. Mine has a harsh down shift too and I need to get this done here soon.