EDC Help!! - The Unofficial BMW M5 Messageboard (m5board.com)

AGIL · 14th November 2005, 19:00

Fellow E34 M5 Enthusiasts,

I have a 94' 3.8 with 65,000 miles on it. I have investigated deleting the EDC altogether, and I am choosing not to regardless of the cost.

Here is the scenario;

EDC P and S lights work the standard green color illuminates when selected. There has never been a computer alert for the suspension before on the dash. The car has had the battery cable disconnected for other minor work so the resetting the ECU is thing does not seem to be relevant. When driving on the highway at high speeds the front end bounces up and down a lot. The rear seems fine in all accounts.

I have researched the cost of the shocks and even the ECU so I am aware of the costs. What I want to know is if the suspension is shot why are there not any message warnings? Also Could it be a bad ECU? And if I replace the front shocks do or should I replace the rears as well?

Any help, suggestions, comments would be greatly apprecited.

Thanks

madm5 · 14th November 2005, 20:20

Is it set to S or P? Should be on S as that is a lot firmer assuming you have the switch. Mine is bouncy when set to P

farrell · 14th November 2005, 21:05

Quote:

Originally Posted by AGIL

Fellow E34 M5 Enthusiasts,

I have a 94' 3.8 with 65,000 miles on it. I have investigated deleting the EDC altogether, and I am choosing not to regardless of the cost.

Here is the scenario;

EDC P and S lights work the standard green color illuminates when selected. There has never been a computer alert for the suspension before on the dash. The car has had the battery cable disconnected for other minor work so the resetting the ECU is thing does not seem to be relevant. When driving on the highway at high speeds the front end bounces up and down a lot. The rear seems fine in all accounts.

I have researched the cost of the shocks and even the ECU so I am aware of the costs. What I want to know is if the suspension is shot why are there not any message warnings? Also Could it be a bad ECU? And if I replace the front shocks do or should I replace the rears as well?

Any help, suggestions, comments would be greatly apprecited.

Thanks

If the EDC dampers are weeping, there will NOT be a warning.
Jack up the front end & look for signs of weeping out of the top the damper.
If you have obvious fresh hydraulic oil , then its history.

Replace dampers & top up reservoir with CHF11S.

I would add that you dont have to replace dampers as across axle pairs as with conventional dampers.
Single unit replacement is ok as pressure for each damper is controlled via solenoids energised by inputs from steering angle potentiometer, speed input from axle & horizontal / vertical accelerometers.

If no leaks then check rear self levelling pipes & also examine suspension springs for damage / fatigue.

Farrell

yewcorner · 15th November 2005, 02:03

Hi All

Just to avoid confusion; the front EDC dampers are self contained units and have their self contained fluid resovoirs. The rears are fed via the same SLS resovoir which also supplies the power steering system.

Quote:

Originally Posted by farrell

If the EDC dampers are weeping, there will NOT be a warning.
Jack up the front end & look for signs of weeping out of the top the damper.
If you have obvious fresh hydraulic oil , then its history.

Replace dampers & top up reservoir with CHF11S.

I would add that you dont have to replace dampers as across axle pairs as with conventional dampers.
Single unit replacement is ok as pressure for each damper is controlled via solenoids energised by inputs from steering angle potentiometer, speed input from axle & horizontal / vertical accelerometers.

If no leaks then check rear self levelling pipes & also examine suspension springs for damage / fatigue.

Farrell

rjack · 17th November 2005, 01:27

Exactly, only replace units that are leaking. I notice you are in Ft. laud. I have a shop there if you want to bring it round and have it checked.
Richard.

AGIL · 17th November 2005, 01:52

Really! Small World. who is your shop, I know a lot of people in the car business here?

Quote:

Originally Posted by rjack

Exactly, only replace units that are leaking. I notice you are in Ft. laud. I have a shop there if you want to bring it round and have it checked.
Richard.