Excessive front wheel tire spin when hot

A

askoncemore

New member
I am getting excessive front wheel tire spin after beating up on the Flex a bit.  Part throttle will spin.

After cooling down it goes away.

Is this due to the computer seeing the hot transmission fluid temperature(205-210) and adjusting the power output to the RDU?

Traction control is off. PTU and trans fluid recently changed.
 
I dont think 210 is anywhere near what the ecu considers to be hot....normal at worst

Id have to look bit i didnt notice any scalars or functions in the tune taking action until transmission temps reach at least 275...they call it TOT...transmission oil temp

Remember the the oild dipsticks and pans for trans that say oil could reach 350...thats why i find it funny when some of u guys are freaking out about 200 degree fluid
 
IIRC the clutches will disengage completely when they get too hot.  Clutch engagement will return back to normal once the temps have returned to their normal range.
 
Brick any codes set?? and certainly the (clutches)can over heat,might also need to check the speed sensors for dirt buildup,corrosion.  Z
 
No temperature PIDs that I've seen (or even a sensor to measure it I believe) for the RDU but there is a PID that will tell you what % is being commanded to the rear and if the AWD system is engaged or not.  (See the Torque PIDs thread stickied in the datalogging section).  I would at least be interested in seeing if the car is still calling for AWD when it is slipping or if the ECU isn't commanding it because it knows something is overheated...

There aren't any clutches in the PTU - it is always spinning when in gear.
 
Brick did you ever change the RDU Fluid? How many miles?  BTW have you tried a kam reset or removing the ground from the battery for an hour to reset.  Z    https://www.youtube.com/watch?v=hZAsoqmqhdM      BTW it sounds like the TCC (torque converter clutch)is stuck in the apply position restricting flow when commanded open,which will cause the converter to overheat.  Z
 
SHOdded said:
Gray Brick said:
Is the RDU clutch pack rebuild able?
Click to expand...
I suppose it could be, but I've only ever heard of outright replacement of the entire RDU in these applications.
Click to expand...
I was told when my RDU was replaced it is not a serviceable part and must be replaced as a whole unit.  Except for fluid changes.
 
U can rebuild it ..parts are available...dealerships prefer to change parts...less likely for things to go wrong
 
Sure but you won't be able to find anyone willing to rebuild it the labor cost would be more than two by the unit out right that's why they do that. Look around I'm sure you can find the parts also
 
I can confirm that the price on the PTU complete unit has dropped fairly considerable compared to a couple years ago,this is what my dealer informed me after having my PTU Flushed,not sure if this is related to the plant in Mexico.  Z
 
Hey Grey....  Sorry, I just read this post.  So, I had this happen to me as well in my flex once.  I was worried.  Was messing around on the street doing multiple boost launches and then suddenly just blowing off the front tires like crazy.  I thought it was a fluke so I was coming out of a turn and got on it and just smoked the front tires at half throttle.  It has only happened the one time.  Haven't had a problem since.  So I would say its most likely a heat issue that stops the rear from engaging.  I don't think this is anything to worry about to be honest.  I was at first but not anymore.
 
So is it from a hot trans, rdu, etc.?

It has happened to me a few times and after the Flex cools it goes away.

Trans temps are usually around 205 when it happens... coolant is at 180 degrees.
 
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