Quote:
Originally Posted by Homerlovesbeer
It could also be the accumulator....
Your problem sounds like the pump possibly failed to start but a "reboot" fixed it?
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How would I know if its the accumulator? If I had to guess Im just checking to see if air is escaping from the fitting using water and soap right?
Its weird a few weeks back I got the tire low light but when I checked the tires they werent that low. Then the day I got the error same thing happened the tire low light came on and a few minutes later the Inactive Suspension came on. I did notice a few days later when I was driving home for a few minutes the suspension inactive went away and came back and been on since.
Quote:
Originally Posted by Henn28
The wood pellets shouldn’t matter. My first guess would definitely be a leaky bag, but they’ve been holding air since the error message? Have you ever replaced them? If a bag is leaking then you will certainly hear the pump running more than usual. Can you let it sit for a couple days and then see if the rear end is sagging? normally the pump doesn’t run very much at all, just over uneven terrain, my sloped driveway approach, etc. Id still lean towards a very slow leak, and a leaky bag won’t fix itself. I’ve used Arnott replacement bags with very good luck (not a fan of their Jeep spring conversion though), and it’s an easy do-it-yourself job.
Beyond that the usual failure points are one of the self leveling switches on the rear subframe, by the air struts, corroded wiring/connector to these switches, or the pump/plumbing itself. There is an eBay guy who sells a rebuild kit to the pump, if it turns out to be that. New ones are expensive.
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The next day I drove home with that error light the drivers rear was sagging lower then the other side. Later that night I went to the car and started it and the pump inflated everything back up and thats when I decided to move the pellet bags around and yesterday it seems to be holding. I havent checked this morning. Since Ive owned the car I have not replaced the air bags and not sure if the previous original owner ever did as well. If it wasnt so cold and raining I would have crawled underneth it to see how bad of a shape they are in.
To me the pump is so faint that I rarely even know its running. Probably doesnt help I like to listen to music while driving either lol. I started the car last night so will let it sit and keep an eye on the rear to see if it starts sagging again. Im currently trying to get ISTA software so I can see more in depth with that. I already ordered a set of Arnott's figured I have them on hand when I do have a chance to go out and check things out.
I found him last night which it seems like alot of people use. Looks like its just seals and nothing more?
Quote:
Originally Posted by PropellerHead
I just bought this kit for the original pump from my '04 with 4 corner air. The rebuild kit is the same for 2 or 4 corner, but the part is different- be sure to order the correct replacement pump for your suspension.
The rebuild is easy with plenty of pdf's and videos about how to install it. We just got the SLS error again last week in the 4.8. It is apparently the pump. So, my plan *was* to take the existing pump from the 4.8, rebuild it, and then install it into the 4.4- which has started a nice subtle lean to one side. There are no errors yet. We have never replaced the pump on the 4.4 with 60k miles. We used to be able to hear it whirring back there. Since we don't hear it any more, my thought is that the pump will need a rebuild soon enough.
Unfortunately, the wires in my 4.8 pump that I replaced a 5-6 years ago are fried. It appears that the pump got very hot and affected the wires. (See pics). Some of the insulation is off as well as a few hotspots on the wire. Not gonna use it again.
So, my plan is to buy a used Wabco 4 corner pump from eBay- they're everywhere and from ~$150 up. I will then rebuild that one for the 4.4. There are cheap units that are new and not OEM/Wabco, but I don't trust them. This is gonna be an expensive month for BMW ownership.  |
Thanks for the link. Ill check it out and may just buy a repair kit and have it on hand while doing everything.
How loud are these pumps supposed to be? Reason I ask is that I can barely hear it. Even when I have the rear lid open and listening I can hear it but its pretty faint. Does that mean its going bad?
Is it common for these pumps to get that hot? I thought these had heat sensors so they turn off if they get to a certain temp? Have you maybe considered soldering on a new set of wires or building a new set from scratch? Color will be off but as long as you color code the wire I dont see that being a problem.