Idler smoke from 2010 635D

[Cincoon]

Purchased a 635d about ten months ago. I bought this car from a dealer and have been dealing with their issues ever since. A few weeks into owning it, an injector went out. When I finally got it back, it started smoking shortly after. The dealer basically told me that the smoke was normal for the mileage (the car is under 90k), but I insisted that it wasn't for a standard 6 series with no modifications (no dpf removal, etc.). The car was smoke tested and apparently needed an intake gasket, but that didn't solve the problem. Even after the gasket was changed, the smoking persisted, especially at idle and when the throttle was slightly blipped. The problem went away once the car was warmed up. I haven't had the car for over seven or eight months since buying it. But it would smoke if you left the vehicle rest for less than an hour and then started it again. They installed stem seals, and throughout the little time I owned it, I didn't notice any oil loss, even after they failed to repair it. The turbos were tested and found to be in good working order as the engine was obviously out. Reassembling the vehicle and communicating with the dealer again. I was planning on declining the automobile, but I ended up taking it. The injectors were sent when it was discovered that one of them was operating at 100% duty cycle; after being changed, it continued to smoke. This is just a typical occurrence, the establishment is claiming. Is anyone in agreement?

It had a new glow plug module installed before I acquired it. They changed the intake gasket, cleaned the turbo's seals, and examined the injectors.
They sent the vehicle out for repairs without checking ccv, maf, etc., which is surprising. So, I'm curious if anybody has any ideas or if this is typical (which I don't think)—I'm sending it in for a mot since it's due soon, so I'll see out how it is on emissions. Thank you!

[Syncephe]

When I sold my 635 d, it had 147,000 miles on the odometer and never made a sound. You won't see any blue oil smoke or black scoot. The automobile would still not pass muster with me after everything that has been done.
good luck

[Cincoon]

Good day, what a blessing! I hoped they would deliver a few months in, but they denied my request for a refund, despite my trust in their ability to do so. Nevertheless, I intend to. Much obliged.

[MamaKiddo]

There is no smoke when I drive my ancient 3.0D, which has 200k miles on the odometer.
After 90k miles, it's just run in, and changing the oil every 6-7k or 12 months will increase its performance by a factor of three or four.

[Cincoon]

After all the effort put into it, I don't understand what happened as it seemed to have regular and quality services throughout its existence.

[Bleakerje]

It sounds rather bothersome! Based on what you've said, a 635d producing considerable smoke during cold starts isn't exactly "normal," particularly after replacing and checking all the parts. Something like CCV, MAF, or an injector problem may be lingering. I would insist on a correct diagnosis instead than being told it's normal, although it's worth seeing what the MOT and emissions reveal.

[Cincoon]

There's enough smoke to make you wonder if anything is wrong, but the dealer insists it's normal. They've already promised to return the vehicle to them if it passes inspection as sound and problem-free, adding they're tired with choices and have tried everything. I suspect they are attempting to avoid doing any more repair or diagnostics on it since it was returned to them weeks into ownership over worries about smoking under warranty. Originally, the warranty was for three months, but I believe I am protected under the Consumer Rights Act —

In the event that a problem is reported within the warranty term and the repairs are unsuccessful or take too long, the warranty will often continue to cover that particular, continuing issue. This is to prevent recurring faults.
"One Shot" at Repair: The Consumer Rights Act states that if a seller fails to fix or replace a defective car, the buyer has one chance. It makes no difference whether the warranty has already expired; if the repair doesn't work, you may be able to get your money back or have your car rejected.



It has been about ten months since I purchased the automobile, give or take a little. The problem was detected rather quickly—within a few weeks—but the garage has been giving conflicting reports and has been throwing parts at the problem without really fixing it.