Has anybody ever had the car basically be in fwd? What controls the car to apply power to rear wheels? My car burns the front tires with ease.. It has a unleashed tune. Is there a sensor that controls this? I want to change ptu fluid, car has 55k on it. Don't know if it has ever been changed.
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I'd like to see what you consider burning the front wheels because so far everyone that's said that and had a video I disagree with..it may spin and squeal and cause a commotion but it's not really hurting acceleration..let it sequel and eat
Seems to take at least 600 hp to do awd burn outs from what I know...could you have a fuse blow or something disconnected at the rear diff?
With traction control on the light is flashing constantly from a stop. If I turn the tc off is spins at least one tire through first gear and into second to about 30 mph. It's not squeaking the tires. This happened 2 weeks ago, I flashed stock tune back on, it went away. After a bunch of wot burnouts the stability control light came on and the left hand display said service stability control last time this happened. This has not happened yet this time, but it is acting exactly the same. Torrie said he never came across this problem. Would it have anything to do with the tpms light being on. Maybe it reverts to front drive when low pressure is sensed?
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It's jacked up..take it to the dealer
The system is likely not getting accurate data from the wheel sensors/TPMS, which is putting it into an error/safety mode, hence no awd engagement. Hopefully that is the extent of the problem and has not migrated to the PTU being burnt up.
It has not happened with stock tune yet. So the dealer will not be able to help. I think it's more sensor related than ptu because as soon as I changed the tune it went away
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Quote from: f8tlSHO on July 06, 2015, 10:36:03 AM
It has not happened with stock tune yet. So the dealer will not be able to help. I think it's more sensor related than ptu because as soon as I changed the tune it went away
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Were there any codes set? I know with mine I got a communication error code when it happened once where everything shut down including the AWD.
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Quote from: ShoBoat on July 06, 2015, 10:39:32 AM
Quote from: f8tlSHO on July 06, 2015, 10:36:03 AM
It has not happened with stock tune yet. So the dealer will not be able to help. I think it's more sensor related than ptu because as soon as I changed the tune it went away
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Were there any codes set? I know with mine I got a communication error code when it happened once where everything shut down including the AWD.
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Dude you have an awd car that's supposedly blowing off the tires with a flashing dash light...it sounds like the dealer could help...sometimes there is way too much speculation on problems here....sometimes when I race I get a service advancetrac message..I think from brake boosting and launching hard...then I restart the car and it's gone
Quote from: ajpturbo on July 06, 2015, 10:50:00 AM
Quote from: ShoBoat on July 06, 2015, 10:39:32 AM
Quote from: f8tlSHO on July 06, 2015, 10:36:03 AM
It has not happened with stock tune yet. So the dealer will not be able to help. I think it's more sensor related than ptu because as soon as I changed the tune it went away
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Were there any codes set? I know with mine I got a communication error code when it happened once where everything shut down including the AWD.
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Dude you have an awd car that's supposedly blowing off the tires with a flashing dash light...it sounds like the dealer could help...sometimes there is way too much speculation on problems here....sometimes when I race I get a service advancetrac message..I think from brake boosting and launching hard...then I restart the car and it's gone
All very true, that said he cannot replicate with the stock tune. At least if there are any codes set it might point him in the right direction. It's a little hard to walk up to the manager at the dealer and say "dude I have a problem with my car, it roasts the tires off it when I have my tune file loaded. Can you help me?"
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Not yet this time, last time yes, but I forgot to check before reloaded stock tune.
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Quote from: ShoBoat on July 06, 2015, 10:55:06 AM
Quote from: ajpturbo on July 06, 2015, 10:50:00 AM
Quote from: ShoBoat on July 06, 2015, 10:39:32 AM
Quote from: f8tlSHO on July 06, 2015, 10:36:03 AM
It has not happened with stock tune yet. So the dealer will not be able to help. I think it's more sensor related than ptu because as soon as I changed the tune it went away
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Were there any codes set? I know with mine I got a communication error code when it happened once where everything shut down including the AWD.
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Dude you have an awd car that's supposedly blowing off the tires with a flashing dash light...it sounds like the dealer could help...sometimes there is way too much speculation on problems here....sometimes when I race I get a service advancetrac message..I think from brake boosting and launching hard...then I restart the car and it's gone
All very true, that said he cannot replicate with the stock tune. At least if there are any codes set it might point him in the right direction. It's a little hard to walk up to the manager at the dealer and say "dude I have a problem with my car, it roasts the tires off it when I have my tune file loaded. Can you help me?"
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what he said... Lol
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They do have diagnostics they can run without cel or dtc...and often they already encountered similar problems
Quote from: f8tlSHO on July 06, 2015, 10:57:00 AM
Not yet this time, last time yes, but I forgot to check before reloaded stock tune.
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If and when it does be sure to write them down. It could be an indication of what is wrong with the car. Chances are if something is wrong and it's mechanical it's only a matter of time before it shows up with the stock tune loaded.
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I had this happen on my 13 flex. Was messing around taking some quick 0-50 runs and then leaving a light coming out of the turn I floored it and the front tires just roasted off. Then leaving the next light to check it I got into it and just roasted the tires through the intersection. Not sure if I got the PTU too hot or what happened. But haven't had a problem since. I was pretty worried. But if yours is doing it all the time then that's strange.
Is the driveshaft always under power to the rear, and the differential have something that decides how much power to allocate to the rear tires?
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Driveshaft will always spin. The PTU is direct drive. Rear end has electronically activated clutch packs
Quote from: ajpturbo on July 06, 2015, 12:52:09 PM
Driveshaft will always spin. The PTU is direct drive. Rear end has electronically activated clutch packs
Ok, I thought that's how it worked. Thanks
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So if ptu is under power all the time, the problem would be with the rear differential electronics malfunctioning most likely, or the signal going to the electronics in diff
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Quote from: f8tlSHO on July 06, 2015, 01:55:46 PM
So if ptu is under power all the time, the problem would be with the rear differential electronics malfunctioning most likely, or the signal going to the electronics in diff
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You could always log the AWD modulation PID, that would tell you it the car is commanding the AWD to engage.
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Quote from: ShoBoat on July 08, 2015, 11:21:04 AM
Quote from: f8tlSHO on July 06, 2015, 01:55:46 PM
So if ptu is under power all the time, the problem would be with the rear differential electronics malfunctioning most likely, or the signal going to the electronics in diff
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You could always log the AWD modulation PID, that would tell you it the car is commanding the AWD to engage.
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Good idea, didn't know I could do that
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Any idea where the awd modulation pid is? I cannot find it in live link
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PID 22d128
More info here:
http://www.ecoboostperformanceforum.com/index.php/topic,3141.615.html (http://www.ecoboostperformanceforum.com/index.php/topic,3141.615.html)
Ok, I will look for that tonight. Thanks
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Does livelink/SCT let you watch custom PIDs? I'm trying to remember from my X3 I had previously but I don't believe you could. If not you will need to pick up Forscan or use Torque (or something similar) to monitor it.
Not sure, I am new to sho tuning. Used a moates quarter horse and binary editor for my 93 mustang
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Ok, no need to log this. The ecu must put the car in fwd when there is low tire pressure. I just got my new wheel today, got the tire swapped over. No more ridiculous spinning of the front wheels. Instantly went away. Can't believe nobody else ever had this issue.
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Always a first time! Good to know, and glad the "issue" is an issue no longer :thumb:
Quote from: f8tlSHO on July 10, 2015, 04:51:52 PM
Ok, no need to log this. The ecu must put the car in fwd when there is low tire pressure. I just got my new wheel today, got the tire swapped over. No more ridiculous spinning of the front wheels. Instantly went away. Can't believe nobody else ever had this issue.
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Diameter difference must've put it I safe mode. Actually makes sense.
Did the awd off notification pop up?
It was doing this before the donut was on, no it didn't pop up
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Are u kidding me?...there was a donut on?....wow u should've put that in your first post...funny how good details sometimes come out later
The wonderful features of the remote start would of avoided this predicament. Z
Wasn't a donut right away, I filled the tire up daily until I got tired of doing that. I use remote start all the time, what does that have to do with it
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Quote from: f8tlSHO on July 10, 2015, 08:06:07 PM
Wasn't a donut right away, I filled the tire up daily until I got tired of doing that. I use remote start all the time, what does that have to do with it
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The remote start feature is disabled if any of the tpms detects a low pressire tire and stores a code on the dashboard,great to hear you resolved your issue. Z
Dunno, I didn't have any codes and I start it remotely all the time.
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Quote from: ShoBoat on July 06, 2015, 10:55:06 AM
Quote from: ajpturbo on July 06, 2015, 10:50:00 AM
Quote from: ShoBoat on July 06, 2015, 10:39:32 AM
Quote from: f8tlSHO on July 06, 2015, 10:36:03 AM
It has not happened with stock tune yet. So the dealer will not be able to help. I think it's more sensor related than ptu because as soon as I changed the tune it went away
Sent from my iPhone
Were there any codes set? I know with mine I got a communication error code when it happened once where everything shut down including the AWD.
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Dude you have an awd car that's supposedly blowing off the tires with a flashing dash light...it sounds like the dealer could help...sometimes there is way too much speculation on problems here....sometimes when I race I get a service advancetrac message..I think from brake boosting and launching hard...then I restart the car and it's gone
All very true, that said he cannot replicate with the stock tune. At least if there are any codes set it might point him in the right direction. It's a little hard to walk up to the manager at the dealer and say "dude I have a problem with my car, it roasts the tires off it when I have my tune file loaded. Can you help me?"
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I get that occasionally also, only when I drag race, not on road courses.. on restart it goes away.
Rule #1. AWD cars must have all same diameter tires.
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Must be a pretty low psi to cause the awd not to work. People have been airing down tires at the track without issue.
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