M54 DISA fix

[workingonit]

Originally Posted by Factory6speed

I finally got to doing a smoke test yesterday. The disa o-ring is leaking bad. I'll have to take it off cover that up and retest. The large diameter short vacuum line there to the CCV is also leaking. The fuel trim codes have progressed to system too lean codes.

I'm looking at this disa thing and I have all the symptoms of a bad one. Is this the repair kit you went with? https://germanautosolutions.com/gas-...-oem-bmw-disa/

I think I'll do that over buying a cheap one. I'm hopeful just that and a new vac line is all she needs.

I've been looking for the cause of my lean fuel trims for over 3 years now, smoke-testing and all, with no success (maybe the used Siemens MAF that X5chemist sent me will tell me something... when/if the bad piriformis/peroneal tendontis/sciatica in my right leg lets up enough for me to drive).

One of the early things I tried was inspecting the DISA valve, which was rattling. I'd read that the pivot pin inside might fall into a cylinder and hole a piston (I think bimmerbreaker said it wasn't true), so I bought the $65 G.A.S. repair kit, since it was surely better than $10 kits on Amazon.

It was easy to repair, and I used the improved O-ring, too, so it should be good for many years. P.S. it wasn't ever leaking, but now I wasn't worrying about it either.