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  #11  
Old 05-25-2021, 10:54 AM
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Quote:
Originally Posted by llibnep View Post
When off the ground, engine off, I can freely spin the 2 front wheels, spinning either wheel will spin the front shaft. Spinning the front shaft by hand spins the left front wheel.
Engine running the rear wheels spin the second it is in D, the front wheels or front shaft from the TC do not spin unless I increase the engine speed upwards of 1500 rpm and then they barely move as if being braked or binding but when this is happening I can spin either wheel by hand easily.
I thought about the DSC causing this so I pressed the DSC button on the console, the yellow light came on the instrument panel but it did not have any effect on the problem.. I didn't think about unplugging or a fuse.
My next thought was the recently replaced left front cv axle as it does not spin as freely as the right front. I checked to make sure it was inserted fully, multiple times and it was. So, I removed it. After getting the clip to release I grabbed the shaft to pull it out and it easily extended at the inner boot, much more than I thought it should. I have replaced 5 or 6 on different vehicles and not one has extended like this. When I finally got it out I could not easily get it to retract back. I had to hold it vertically with that end on the ground then lift the axle up and then down smacking the ground, think of slide hammer, doing this multiple times until it finally retracted. I have it in my vice and when I extend that end I feels very rough, and the same goes for when I push it back, like there are notches or its catching inside the boot. I thought about removing that boot to inspect the joint and the cage but have not done so yet. I did order a new axle.
Can I run the vehicle, in the air, in drive, with that cv axle out of the differential to see if the issue still exists?
Was the gearbox on neutral or park? If you lift just one front corner with gearbox on park it should not turn freely. If it does and the front propeller is also turning freely the splines are busted.
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  #12  
Old 05-25-2021, 12:12 PM
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If the "wind and release" sounded like a bright "ping" sound it sounds like the prop shaft spline.


You can usually reproduce with a hard left turn with a fair amount of throttle. It will usually "ping ping ping" as you turn.

You won't be able to turn the shaft by hand. If it was that bad the car wouldn't move under its own power.

Your description of the fronts pushing back does capture the essence of what would be going on but a little different in what is happening.

The "spring" winding up is the prop shaft tightening up the front drive train and the release that "pushes back" at the front is when the front wheels stop pulling when the spline slips. It will seem like the front is binding or pushing back.
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  #13  
Old 05-25-2021, 05:13 PM
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Three Things..

1st. andrewwynn and Bdc101 you were right.. DCS is causing this.

2nd. My statement "while this is happening the wheels spin freely by hand" is unintentionally misleading. When this happened I would take my foot off the accelerator and go to each front wheel and each would spin freely.

3rd. I jumped the gun and started this thread instead of continuing on with my last thread where I resolved my trifecta problem, which then distanced this problem when I solved the other thinking they were not related.


So, after reading the posts, the one that stuck out to me was to disable DCS/ABS by unplugging or remove fuses. I decided this was the route to go but the axle was a problem. To ease my mind to reinstall I contacted the cs of the manufacturer of the cv-axle and explained the problem I was having, not with the vehicle but strictly the cv-axle, and providing my contact information.. Surprisingly shortly there after an engineer contacted me and asked for photos, which I sent, which he viewed and stated either there was a problem with the boot and/or I, in an overzealous attempt to remove it, extended the inner joint pulling the rollers inside out of their channels. He stated they would send me a new boot and clamps and gave me a few pointers but saw no reason not to reinstall as long as no serious mileage until the new boot was installed.

So to make this short story longer.. I reinstalled the cv-axle and pulled the DSC/ABS fuses. As I was doing this it hit me, and why didn't it hit me before? Because i started a new thread and chased a rabbit down a hole. This problem started when I solved my trifecta problem. When the trifecta was present DSC/ABS was disabled.. While it still took a little bit of accelerator to get them moving as compared to the rear wheels, the braking or binding of the front wheels is no longer an issue and the wheels spin with acceleration.

So now what? Is this an issue with one of the front wheel speed sensors? the DSC/ABS module?
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  #14  
Old 05-25-2021, 06:18 PM
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With proper diagnostics you can see the individual wheel speeds on DSC module to check if there is discrepancy.
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  #15  
Old 05-25-2021, 06:41 PM
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Quote:
Originally Posted by Clavurion View Post
With proper diagnostics you can see the individual wheel speeds on DSC module to check if there is discrepancy.
With fuses removed to disable DSC module will I still be able to read wheel speeds?
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  #16  
Old 05-25-2021, 07:49 PM
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I replaced the fuses. Vehicle off the ground.
Running INPA.. (viewing individual wheel speeds)
Vehicle running and in D
Rear wheels, immediately spin but no recorded L or R rear wheels speeds..(speedometer is not moving either)
Front wheels, (DSC braking condition is back), with acceleration and then hold for consistent speed Right front recorded speed is 6.7mph, Left front recorded speed is 4.5mph
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  #17  
Old 05-25-2021, 07:52 PM
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Quote:
Originally Posted by Clavurion View Post
Was the gearbox on neutral or park? If you lift just one front corner with gearbox on park it should not turn freely. If it does and the front propeller is also turning freely the splines are busted.
Does it matter if rear wheels are in the air or do they also have to be on the ground?
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  #18  
Old 05-25-2021, 08:16 PM
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In park.
Only L F wheel off the ground
wheel does not spin by hand.

In park.
Only R F wheel off the ground
wheel does not spin by hand.
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  #19  
Old 05-25-2021, 09:27 PM
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Am I understanding this correctly?

The DSC is braking the front wheels because there is no speed input from the rear wheels, only the front wheels. So as far as the systems knows, electrically, the front wheels are losing traction as compared to the rear wheels, regardless of the actual mechanical movement of the rear wheels.
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  #20  
Old 05-26-2021, 01:00 AM
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Sounds like a likely hypothesis. Rear wheels don't get a speed signal but fronts do, therefore the DSC brakes the fronts. The DSC could be considering this to be an icy road scenario where the fronts are on ice but the rears are not. Doesn't seem like a mistake that the 7 series module would make since it would not brake the fronts using ABD on a RWD car.
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