Actually that might be a good idea if I can supply power from the delay relay direct to the drive pack, without connecting the ECU to the drive pack. That'll tell me if the rogue current is leaking from the drive pack or commanded by maybe another leak in the ECU. Hmmmmmm

Yep..... the only way I can think of to test the ECU or the driver pack without actually bunging a replacement in there and see what works..... is to go over the connectors, pin by pin to see which has voltage when it shouldn't, but even that will require some sort of special equipment- at least...

Yeah... sorry about that. My braincell fired just after I hit "Post Reply". I've edited my post to answer you.

I don't think @wammers is talking about coding. It's possible that the ECU is sending 12v to the inlet and airspring solenoids when it shouldn't do, causing the car to rise. The other possibility is that the rogue current is being fed by the driver pack to the solenoids, but we do agree that...

The delay relay can switch on as often as it likes but if the ECU is not somehow commanding a rise and neither ECU nor driver pack is somehow leaking current into the inlet and airspring valve solenoids then the car won't rise anyway, no? IF that's the case (I think it is, but what say you?)...

Yes.... and how it's happening with the battery connected but NOT happening when the battery is disconnected. The current assumption is that something is allowing current to leak into the inlet and airspring valve solenoids when there's current to be had (i.e. when there's a battery present)...

Thank you. That's what I'm doing here- trying to learn. The point is the car DOESN'T rise when the battery is disconnected, therefore no inherent mechanical leak on the inlet or airpsring valves, except for a known, minor, one on the nearside rear. Air stays in the reservoir 10 days, easy. It...

5 years is still pretty good going by my standards! Let's see how I do with this one.

No it doesn't self level- it goes well above the level it should be at. This is what has me thinking that the rise is due to whatever's wrong with it... and its self levelling- downwards is what keeps venting air out of the system and drains whatever is in the reservoir.

It drops at all 4 corners with the rear leading the way. What happens is that if I leave the car parked with the battery connected, it'll rise by at least 1 1/2 inches. Pretty much wading height, and it'll stay there for around 3 days. I haven't staked out the car to watch it continually for the...

Well yes, but that still implies that the rising of the Solihull Horror is commanded by the ECU, which may well be faulty but it's still hard to see how a faulty delay relay will itself cause the rise. I sure hope it's not the ECU....... because Faultmate is married to it, I can't just swap...

ECU maybe... but how would a faulty delay relay cause the car to rise?

Uhm..... do you have power seats? When you opened it up, was the connector just lying there not connected to anything?

Yeah I thought of that first.... but there's a difference- it rises when the battery is connected but DOESN'T rise when the battery is disconnected. If it was a mechanically leaking NRV or inlet valve then it wouldn't matter if the battery was connected or not, no? But this is great stuff...

Will do buddy- thanks. Let me try just buying a different self tapping screw and see if it'll torque up sufficiently then. Sometimes you can get away with just using a different screw with a slightly different thread. I'll let you know how it goes.

Ok. Sounds good enough for me to give it a try! Once this newest battery dies. Thanks man.

7 years?!!! DANG! Ok- screw it, I'll give the Deka a try.

Oh it's definitely leaking because the rears drop first.... but the rate of the drop is so slow- as I say 10 days to go from normal height to bumpstop I'm GUESSING it's unlikely to run out of reservoir air in 3 days if all it's trying to do is maintain the proper ride height. Plus that doesn't...

Hmmmm... a little over £300 here, but that's before tax. https://www.desertcart.com.my/products/172083814-643-644-high-cranking-starter-battery-12-v-115-ah-1000-cca-330-x-174-x-242-mm-4-year-warranty-mf-31-1000 I'd kind of settled on the Deka 1131PMF which can be had for "only" £200 here before...

Yeah. Dumb. :D