Transmission jolt problem ? Gear 1-2 "Is like i get hit from the rear! 03 X5 4.6 is"

[bosanci28]

Originally Posted by Doru

This reminds me of a few posts on some other BMW forums, where the insulation of the wires around the plastic connector that hooks up to different sensors got frayed, giving all kind of codes. One guy actually examined the wires around the connectors and noticed that the insulation will split and degrade just like the plastic cooling parts.

I just thought to throw this out there maybe this will help some people who read this post and have some "bad sensors issues".

yes, i was reading that somewhere!,thanks for pointing that out!

[bosanci28]

Originally Posted by RRPhil

The P0721 code is very common on the 5HP24. It doesn’t mean there’s anything wrong with the speed sensor, just that it has detected an output shaft speed that the controller wasn’t expecting to see. In other words, a clutch is slipping.

Phil

hmm,from my reading it could be the speedy sensor or other internal parts ,clutches ,etc... hopefully is only that sensor! Not too much money on hand right now to rebuild the tranny ,or get a new one .

thank you,for your advice!

[smwmustang]

My 02 is doing this exact same thing but only when the tranny gets heated up. If I make the turns slow and give it time to shift I don't get the BANG/JOLT but would love to know what it takes to get yours working. My transmission is only 3 years old and about 70,000 miles. Guess they don't make them to last.

Shawn

[bosanci28]

yes, my tranny at 75k and doing this ,very disappointing !

this is my 3rd x5,i mean all my wife,she drives them! i do have a truck,but i love the power in the 4.6, i still have to buy some stuff first ,like tranny oil,filter,and that sensor if that maybe the problem,but who knows,that will happen next week ,as will go for few days out.

hopefully will fix if not may have to go deeper in the tranny.



@smwmustang,

have you done anything with yours?

thanks

[smwmustang]

Not yet, I parked it for a while and then started driving it again and nothing happened for a few more weeks. Finally figured out that if I drive it like a grandma it does not slip. I only have to drive a few miles a day and have not taken it to the indy yet.

If I turn slow and don't try to gun it in the turn it drives fine and i can go days without ever having an issue. It is only when I don't let it shift all the way into gear that it messes up. Sure seems more like the clutch plate or convertor to me but the convertor was changed when the tranny was as well.

My mustangs sure are easier to work on!

SHawn

[bosanci28]

yes, it could be anything wrong at this point, i have to change few basics ,before going deeper into the tranny.

and , i am the same too , i let the rpm go down and then easy go,and it does not doing the jolt ,but if you force it it does.


anyway,will post here updates whenever i get into the x5 to do some work on it.

[fmugur]

Originally Posted by smwmustang

Not yet, I parked it for a while and then started driving it again and nothing happened for a few more weeks. Finally figured out that if I drive it like a grandma it does not slip. I only have to drive a few miles a day and have not taken it to the indy yet.

If I turn slow and don't try to gun it in the turn it drives fine and i can go days without ever having an issue. It is only when I don't let it shift all the way into gear that it messes up. Sure seems more like the clutch plate or convertor to me but the convertor was changed when the tranny was as well.

My mustangs sure are easier to work on!

SHawn

If you drive like a grandma your transmission doesn't heat up much. I would check/monitor the transmission temperature (INPA) and mark the point where you get the symptoms. If this point is above the engine temperature or somewhere above 200/220F then I would recommend to look into replacing the main radiator and flush the coolant side of the heat exchanger.

[ika]

Any news?

[bosanci28]

Not yet,no news.

I am waiting for the INPA cable and software to arrive from Europe,
so i can check what @fmugur was saying!,then will go from there on my next step.

Thanks,

[bosanci28]

i was today at the autozone looking for something and i have discovered on a valvoline max life atf bottle this number also:

LT71141 witch is for ZF Transmissions also based on the ZF chart?

autozone link here ,







well is recommended by valvoline to use...