Valve Block rebuild

[trouttramp]

Morning Gents,

Is anyone able to carry out valve block repairs for a 2000 P38 4.6 V8? My vehicle holds air at maximum height overnight when locked, but if I don’t raise it, it drops to entry height. I’ve recently replaced the air compressor and had the airbags checked, so I suspect the issue is with the more frequently used valves in the block. I’ve seen adverts for rebuilt valve blocks in the past and wanted to ask if any members offer this repair service.

 

[marjon]

Why would it be the valve block? as it uses the same valves in any height.
It could be a leaky bag(or 2) that has a minor split that closes when in extended but opens in normal.

If you pull the relay under the passenger seat when you park it up then any leaky corner will drop but the rest will not move, it may help show whats actually leaking.

Many peeps have done it themselves (even me ) succesfully, its not difficult if you are half handy.

J

 

[trouttramp]

cheers J,

Thanks for the info, I jumped on the valve block as it doesn't move when parked overnight or over the weekend when in extended height and locked. I i leave it in any other height it drops to entry height. The suggestion that an airbag could be leaking but not when extended may be plausible.

I will try the relay suggestion.

Cheers

Colin

 

[marjon]

Pull the relay and let us know what happens .

J

 

[Mark Piercy]

Don't forget it checks it's own height over the time it is locked.
If your parked on anything other than level ground it'll always try to even itself out.

 

[marjon]

Don't forget it checks it's own height over the time it is locked.
If your parked on anything other than level ground it'll always try to even itself out.

Not if the relay is out though.
I am also guessing/assuming the comparison is being made parking in the same place

J

 

[Mark Piercy]

Not if the relay is out though.
I am also guessing/assuming the comparison is being made parking in the same place

J

Upto speed lad.
Before the relay is pulled

 

[pwood999]

When you say "it drops to entry height", do you mean it stays up overnight, and then drops to Access or Standard when you start the car ? If so it's not a valve block issue.

 

[trouttramp]

When you say "it drops to entry height", do you mean it stays up overnight, and then drops to Access or Standard when you start the car ? If so it's not a valve block issue.

no it stays at that height I then lower to drive. If its left in normal road height,motorway height even locked it drops to entry height.

 

[pwood999]

Sounds like the ECU is forgetting what height you last set it to. With the height lock switch on, it should remain at the last height after switch off & when switching on & starting.

Does it have the standard timer relay or the 4-pin fudge to prevent self-leveling ?

FYI I found a bug in the ECU where if power is disconnected at switch off (before the ECU has gone to sleep), then mine would lower to Access at startup. The fix was to use diagnostics to clear any faults (even if none), then shutdown diagnostics & finally switch off the engine & allow the ECU to complete its self-level just as you close the doors.