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#1
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The car is a 2004. It seems like it was replaced at Audi, as everything looks so original, the connector with the resistor has an Audi sticker on it
![]() But the engine runs seamles, smooth and no vibrations. I will replace them anyway but they are so expensive ![]() We have found the other cable too!
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S8 D3 FL II. Porsche Cayenne 958 Turbo BMW E83 X3 3.0d M-Sport |
#2
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I had an 04 D3 and from memory these hydraulic mounts failed when the car was about 6 years old. (Failed meaning they threw an error code on diagnostics when car was scanned. As they were crazy money and could only be got new at the time, I decided against replacing at the time.
I then kept the car for several more years and never had any issue with vibration or similar. I’d leave them to be honest. |
#3
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Don't get used ones as they will also be faulty. New ones are probably a waste of money as they will probably only last a couple of years. My first failed at 3.5 years and don't forget these new parts have been sat on a shelf deteriorating for 10+ years.
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#4
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The FL D2's have similar mounts.
As they're hydraulic, I just thought the electrics were a sensor for when the mount failed? I didn't think they were or are in any way "active"...
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Cheers Marty ____________________ Current: 2001 Audi S8 - Brilliant Black with Black interior, C5 RS6 rims (whenever I actually put them on...), Solar Sunroof, Tinted side and rear glass, RNS-D, Grom, Bose, clunky old phone in arm rest! 2002 Audi S8 - Project Replacement head coming arrived ![]() Silver with Black interior. All features as the '01, with the 'S' mode auto shifter. Dodgey rear tint (need to find a way to get rid of that). Family: 2009 Volvo XC90 V8 R Design - has a louder more obnoxious exhaust than the S8, sounds great! Love this thing - Q7 was double the price, and certainly not double the car! Sold: 1997 Audi A4 - Hamilton's Club Sport, Achat Grey (will miss the old girl) |
#5
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The electrical connection is for a solenoid which controls a valve to an air pocket inside the mount. The ECU controls the effective strength of the mount by switching on / off what is basically an air spring. There's an SSP on them somewhere - I'll see if I can find it.
The D4 actually has a separate computer just to control the active engine mounts ![]() |
#6
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Here's Audis take on the D4 4.0T Tfsi Active Engine Mounts :
Active engine mounts: counteracting vibration for greater refinement Audi normally uses firm, sporty settings for its engine mounts. For many years now certain models – notably the A8 at the top end of the range – and various engines have had switchable electromagnetic mounts. These have two operating settings: at idle speed they have a “soft” characteristic to prevent noise and vibration from reaching the interior, but when the car is being driven a firmer damping rate is selected in order to suppress engine vibration. The active engine mounting that Audi has developed for the 4.0 TFSI takes this technology a decisive step further – it cancels out engine vibrations with out-of-phase counter-oscillations. The key component is an electromagnetic oscillating-coil actuator. This has a rapid stroke that is transmitted via a flexible diaphragm to the hydraulic fluid in the mounting, which also absorbs oscillating movements from the engine. In the fluid these are overlaid by the actuator movements and cancelled out. The control units for the active engine mounts receive their signals from two sources. Engine speed is detected by the crankshaft sensor; these signals are used to compute the precise phase and frequency of the actuator signal. Acceleration sensors on the two engine mounts supply the data that determine the amplitude necessary to cancel out the vibration. When the new 4.0 TFSI is running in the four-cylinder mode, it generates a certain amount of engine vibration and drumming noise of what is known as the second order. They are not typical of a V8, but the counter-vibration generated by the active mounts reduces them to an undetectable level. At idle speed with all eight cylinders in operation, engine excitation of the fourth order occurs. This too is largely eliminated by the active engine mounts so that the engine appears to be running even more smoothly.
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Confidence is the feeling you have before you know better . . . . ![]() Audi A8 D2 3.7 Quattro Sport 1999 FL - Melange 2nd Place Winner - A8-Freunde Annual German Meet 2012 at Edersee 20" x 9" Bentley GTC Wheels with 385mm W12 Front Discs & Bentley Caliper Covers, Front Lowered on Coilovers, Xenons, Combined DRLs and LED Foglights to modified OEM front fog lamp position, Alcantara/Leather, Full Black Alcantara headlining + pillars and blind shelf, Bespoke Flat Bottomed Sports Steering Wheel, Dark Myrtle Wood, Autodim Mirrors, Bose, Blinds, Digital TV, Ski Hatch, Modified rear exhaust section for extra V8 Burble ![]() Audi S8 D2 Final Edition 2002, Avus Silver with Red Leather Interior Tiptronic with Sport mode button, Sony rear entertainment package, Bose sound system, Audi Navigation Plus, 20 inch Final Edition alloys, Full Cat Back Stainless Milltek exhaust, giving a great V8 burble ![]() Audi A8L D2 4.2 Petrol with LPG - Ebony Black Audi A8L D4 FL 4.0T Petrol twin turbo - Havana Black Audi A2 1.6 FSi Sport - Dolphin Grey with Votex body kit and Red Leather Interior and some other A8's A8L's and Mercs |
#7
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How exacty does this work?? ![]()
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S8 D3 FL II. Porsche Cayenne 958 Turbo BMW E83 X3 3.0d M-Sport |
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