Haldex fun, guru assistance needed.
08-20-2007, 04:48 PM
#1
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Haldex fun, guru assistance needed.
Ok. Have had a few symptoms of haldex acting up over the past few months. Mainly at the track I would observe a faint howl / grind from the rear (seemed to be right rear) when at the limits of cornering adhesion in right turns. I initially had attributed this to a wheel bearing that was starting to fail. I had the bearing replaced two weeks ago, but yesterday during some very spirited driving heard it again. There was no evident wear on the removed bearing either.
On occasion, WOT acceleration has produced front wheel spin in a similar time frame to the rear end noise. I tried the roll-out test and seemed to fail, though the surface I was on was not perfectly flat, I initiated the start of the test from the same location, and executed the test in both right and left circles. Under everyday driving conditions and most spirited driving it appears to behave normally: no binding or other misbehaviors.
I STFA and didn't find any instance of this particular sound, though the onset of wheel spin points me in the direction of haldex.
Under warranty all services were performed by the dealership, I trust the mechanics completed filter and fluid changes properly I know my service advisor and mechanics personally from other circles. Since the car has been off of warranty, I have performed all of the recommended maintenance and fluid changes (last one was <10kmi ago).
I just checked the fault codes to find:
01155 - Clutch
04-10 - Mechanical Malfunction - Intermittent
(STFA returned no results on this code)
I picked up an extra bottle of fluid and am about to climb under the car to drain and replace so that I can inspect the fluid coming out. Will check in when I get done.
Any guesses? Controller? Mechanical? Any thoughts on the noise?
TIA.
On occasion, WOT acceleration has produced front wheel spin in a similar time frame to the rear end noise. I tried the roll-out test and seemed to fail, though the surface I was on was not perfectly flat, I initiated the start of the test from the same location, and executed the test in both right and left circles. Under everyday driving conditions and most spirited driving it appears to behave normally: no binding or other misbehaviors.
I STFA and didn't find any instance of this particular sound, though the onset of wheel spin points me in the direction of haldex.
Under warranty all services were performed by the dealership, I trust the mechanics completed filter and fluid changes properly I know my service advisor and mechanics personally from other circles. Since the car has been off of warranty, I have performed all of the recommended maintenance and fluid changes (last one was <10kmi ago).
I just checked the fault codes to find:
01155 - Clutch
04-10 - Mechanical Malfunction - Intermittent
(STFA returned no results on this code)
I picked up an extra bottle of fluid and am about to climb under the car to drain and replace so that I can inspect the fluid coming out. Will check in when I get done.
Any guesses? Controller? Mechanical? Any thoughts on the noise?
TIA.
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08-20-2007, 05:39 PM
#8
The only other..>>
Failure I've heard of besides the controller, is the Electric pressure pump. One of the only replaceable components on the unit...Bout $500 I believe. Evan at 42DD had this failure and one other guy that I know of..
<img src="http://images103.fotki.com/v422/photos/7/7305/1179557/haldexparts-vi.jpg">
<img src="http://images103.fotki.com/v422/photos/7/7305/1179557/haldexparts-vi.jpg">
08-20-2007, 05:58 PM
#10
Well....>
Not sure if that pump will have a specific failure code. Hopefully just a controller. I'd try the upgrade part there first. You might want to email Evan at 42 Draft Design and see if he had any codes specific to the pump...