My X5 35D nightmare :((

[3BEP6]

Hi, guys, I’m sorry in advance but it’s going to be a long post to give full details.

I little history on the car. I bought it in December of 2018 with 84k miles, completely stock, 1 owner from Audi of Virginia Beach with a comprehensive service history and the car ran like a dream for 10k or 1 year. The car is a 2012 35D X5.

One day during pouring down rain I was driving to work and all of a sudden the car shut off on the highway. I pulled over, gave it a crank and it fired up. My mechanic(BMW mechanic with over 40 years experience I used the last 10 years) was on the way to work so I decided to stop by him, the car kept randomly shutting off while on the freeway every few miles but every time restarted right up. Made it to him, he checked the car, found a little wet spot by injector 5, dried it out, car set overnight. He said he checked injectors and they were fine(I thought it was the dreaded injectors shirt from leaking partition).

Picked up the car and it was fine for a few weeks. Then it started to randomly smoke at idle from the tail or sometimes driving(moderately, no heavy acceleration) with a lot of white smoke and pronounced lack of power and knocking, with heavier acceleration it would throw a half engine code. R TD he weird thing also that if it ran fine and you accelerated, it would be doing fine under steady throttle but then all of a sudden it would start puffing smoke, knocking and accelerating on its own even if you pushed brakes, and shutting off after that.

Brought the car in, we checked the codes and it was catalyst threshold temperature on one of the banks. So I brought to dealer for a diagnosis of DPF and SCR as advised by mechanic, dealer confirmed clogged DPF and SCR, I asked to check injectors but don’t think they did. It given $8500 bill for the above mentioned I picked up the car.

As I was going to do it down the road anyway I did a full delete(SCR, dpf, egr, swirl flaps) with DUDMD tune stage 2. After the start, it was running fine but again producing a lot of white smoke at idle and while driving so the problem persisted as well as the same occasional knocking and lack of acceleration.

So we went back to what started it all-water on injectors. Pulled all injectors, sent them out for testing, injectors 5&6 were completely shorted, so last night we reassembled everything with two new injectors(same harness), codes them in. After the full assembly it took probably 20 times to crank and prime the fuel before the car fired up. After it started it ran fine with no smoke, just black smoke on acceleration. Took it for a test run, at first it was ok. Then under a regular throttle(nothing heavy or flooring) all of a sudden the car started pouring white smoke to the point you cannot see behind you with that same knocking, kept accelerating on its own even after pressing brakes, and shut down.

We pulled on the side of the road, checked fluids and under the car, oil is still in the car. No metal particulates or anything in the oil filter, the car cranked but didn’t start as if there were no fuel(just a guess). The only code was fuel pressure plausibility low or something very similar. As it was 2 am already, I just told mechanic I’ll have the car towed to his shop and we’ll deal with it later.

Basically it all seems to started after the damn rain and even after replaced injectors and removal of supposedly clogged SCR and dpf the problem remained unchanged. I’m at a complete devastation as it is my daily and first diesel car, both me and mechanic are lost right now.

When we(I would ask him to work one the car as I was there which he didn’t care about) remover the manifold there was a little oil in it, and turbo bearing seemed fine no rattle or anything.

Please help!!