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#11
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Quote:
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E39 530dA -02 M-Sport Messing metallic E53 X5 3.0dA -06 Sport Stratus grey |
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#12
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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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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#13
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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? |
#14
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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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E39 530dA -02 M-Sport Messing metallic E53 X5 3.0dA -06 Sport Stratus grey |
#15
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With fuses removed to disable DSC module will I still be able to read wheel speeds?
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#16
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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 |
#17
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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
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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. |
#19
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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. |
#20
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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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2003 3.0 5MT Topasblau Purchased in 2016 and surprisingly still running |
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