Help
had the dreaded suspension failure I have replaced the front struts/compressor & valve block front won’t go up any ideas please

 

Wow, that's a lot of items to replace at once, we're all 4 items bad, did you check all 4 corners level sensors ?

Johnny

 

Front struts where leaking then compressor was not building enough pressure I can get the back to go up not the front

 

How.longnhave you run the car for.i left mine idling for a good five minutes and it kicked in.also check your height sensors are connected

 

Along with the above: I have a 2007GT, it's front shocks leak-down when undriven for a few weeks. I have new replacement shocks sitting on a shelf in my shop... replacing them is on my to-do list, but hasn't risen to the top of the list yet. Sometimes the front shocks on this vehicle "pump right up", and sometimes it takes awhile (5 minutes?), and sometimes they won't pump-up at-all if just sitting idling in the driveway... it will remain dead-flat in the front with the "Warning, car too low, stop now" on the DIC. I've found that when they won't pump-up at-all, they will always pump-up if I drive it just a little, albeit, the driving is done very carefully... not that I recommend driving the vehicle if the shocks are dead flat, but: I have a theory: I'm thinking there's a possibility that one of the front height sensors has a dead-spot when the shock is flat and the sensor is at the bottom of it's stroke... because maybe the sensor(s) rarely get used in that position... like a potentiometer that doesn't get swept to the extents commonly gets "bad spots" in it where it isn't commonly swept... that can be "cleaned up" by rotating the pot **** back and forth a number of times. While I don't know how the height sensors are made, if they're pots or what, and I haven't checked my theory with my VCDS to see what the height readings are when the front shocks are dead flat... but I remember when I first got this vehicle (which had be undriven for "a while") and I set the ride height with my VCDS because it was all goofed-up, I occasionally got whacky/ wildly fluctuating and/or "not plausible" readings on the VCDS... but that's seemingly cleared up now that I've had the vehicle and driven it a fair amount. So I'm wondering if there might be a dead-spot in one of the front sensors when the shocks are flat and the sensor(s) is/are at the bottom of it's stoke, and the correctly functioning sensor tells the computer the body is "too low", but the computer doesn't know what to do with the other shock because it's receiving an erroneous/not plausible signal, so it purposely doesn't pump-up, but rather just sits in "panic mode". So maybe jack the vehicle up just a little in the front and see if that gets it to pump-up, or maybe unhook the sensor rods and cycle the sensor strokes a bunch of times, then re-attach the sensor rods?

 

The height sensors are not potentiometers: they're an active design comprising a stator and a rotor.
The stator comprises a multi-layer board that houses the exciter coil and three receiver coils, as well as the control and electronic evaluation unit.
The three receiver coils are star-shaped and arranged in an offset pattern.
The exciter coil is located on the back of the board (stator). The rotor is connected to the actuating lever and moves with it. A closed conductor loop is located on the rotor. The conductor loop has the same geometric shape as the three receiver coils.
You can find a full (21 page) explanation of the whole air suspension system here: http://www.volkspage.net/technik/ssp/ssp/SSP_275_d1.pdf

 

Thanks for the explanation. So much for my theory. But hey, I just remembered: A few years ago I changed the front shocks on my 2008 GTC, and the new shocks absolutely wouldn't pump-up... which seemed all wrong at the time as the old shocks pumped up fine, just one of them leaked-down "pretty quick" (couple of hours). After pulling my hair out for awhile and checking my handiwork, I discovered I had seemingly inadvertently pushed the charge lines too far into the inlet fittings of the shocks resulting in blinding over the passage in the check valve going to the shock. After refitting those lines with them backed-off a little from "bottomed out", the shocks pumped up fine.