[Dovydas.B]

So today I did oil change, but when I removed oil filter and removed oil sump screw to let oil drain, I noticed fuel smell. The same is with oil filler cap its smells like fuel. I did quite a few oil changes myself and never noticed this smell.
Before the oil change I did let the car sit running for about 15-20min (I know is not good thing to do). Also, I found out that fuel smell in oil could be because of short trips which is also my case.
But I also know that open stuck injector could dilute oil to much and engine could fail. I am leaning towards leaking injector because I have rough idle at cold start and small hiccups when car is fully warm (no CEL's car drives nicely).
Spark plugs and Coils are done before 20k miles.
Tomorrow I am going to remove spark plugs to check if any injectors are leaking, but what exactly should I see? some differences in spark plugs? darker colors? also smell? and is there a possibility to do some kind of test with N55 injector with INPA or ISTA?
CAR IS STOCK

[flapeo]

If you still have the oil, do a blackstone labs oil test.

[N54_e90]

whether you idle the car for 20 mins or not, there should be no fuel, and its not bad for the car... you probably have a leaky injector somewhere. Plug will be wet and smell of fuel, and will also have black soot on the tip and top threads. Change immediately to avoid damage to cylinders.

[Mdilo]

I'm having a similar issue. Did you check your plugs yet?

[Dovydas.B]

Not yet, don't have the time. For me question is how to check injectors with Diagnostic tools..

[Mdilo]

As far as I know there isn’t a way to check the injectors with a scan tool but I could be wrong. I checked ISTA and I only see the option to code the injectors if you replace 1. I found a video where someone removed the injectors and connected them to the fuel rail outside of the engine and cranked the engine over to see if they leak under high pressure. The video is of a N54 but you can test the N55 injectors the same way. I tried this and mine didn’t leak with this test but I think mine leak when they’re hot. When you get a chance to check your plugs it should give you an indication if someone is wrong.

[Dovydas.B]

Originally Posted by Mdilo

As far as I know there isn’t a way to check the injectors with a scan tool but I could be wrong. I checked ISTA and I only see the option to code the injectors if you replace 1. I found a video where someone removed the injectors and connected them to the fuel rail outside of the engine and cranked the engine over to see if they leak under high pressure. The video is of a N54 but you can test the N55 injectors the same way. I tried this and mine didn’t leak with this test but I think mine leak when they’re hot. When you get a chance to check your plugs it should give you an indication if someone is wrong.

Did you had a chance to check your plugs?