Cars shut down at low rpm after oil change

O

oltreseba

New member
Hello everybody,

Car: z4 e85 2.5si (2006)

I've done the following works on this car:
- Changed oil (because it was 2 years old). I've used a castrol edge 5w30, *bought online*
- Changed oil filter (together with supposed seals)
- Changed air filter

After these I'm experiencing the following problem:
- The cars shut down at minumum rpm, especially when It's in temperature, not cold.
- When the car do so it usually accelerate a little (like it's not able to keep the minimum, so it increase rpm) and then it shuts down

Sometimes when this happen also the engine light turns on.

The mechanic checked the car, and was not able to reproduce the problem.
Reading the error he said that it was related with some oil problems, about a distribution chain tensioner (sorry if my language is inappropriate). He did nothing because he couldn't reproduce the problem.

After checking the car myself and the error happened again (error that the mechanic was not able to reproduce while I did only after 5km :? ) and again the engine light turns on. This time reading the error was something about an air sensor for vanos. It looks like something similar to what described here: https://z4-forum.com/forum/viewtopic.php?t=17204 even if i'm not sure that my car has one of the engine mentioned, plus i only have problem a really low rpm. (although i'm not really sure if at other regimes i've less power than usual).

The mechanic, of course, is quite suspicious about the oil that we bought online, and about the work we did, but I'm quite sure about the work (not totally about the oil, even if the website we used is quite famous).

Does this ever happened to anyone? could it really be fake oil or something?

Thank you all.
 
Check your air intake for cracks, and as daft as it sounds make sure the oil filter housing is secured properly.
 
I've already checked the first part of the air intake for crack, that was the first thing I thought about, maybe moving the air conduct to open and put the new filter caused some crack (since the car is like 12 years old and usually it stays outside, so plastic may become less elastic). But I found nothing.

It may be worth to check the oil filter. Quite sure it's fine, but it may be like the easiest thing to check.

Thanks.
 
This is the N52 engine so unlikely to be a cracked intake elbow. The primary idle controls are the valvetronic motor and the eccentric shaft sensor. Is it possible you spilled oil when refilling and it got onto the sensor???

Also, the vanos solenoids would be very worthwhile cleaning out which could well be related to the Vanos error codes you were seeing. very quick and easy job. Read this thread... https://z4-forum.com/forum/viewtopic.php?f=3&t=106219&hilit=eccentric+sensor
 
You havent dislodged the MAF sensor which is close to the air filter have you. I doubt its anything oil related unless you sprayed oil around and most likely associated with changing the air filter. I would carefully check that whole area again
 
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