2.0 TSI miss fire help

[joey210]

Hi all,

I am currently pulling my hair out and need your help, desperately.

I have a miss fire on cylinder 2. On tick over you can feel the car shaking slightly where the car is miss firing and under load the car hesitates. Anyway, i have taken the following steps to fix it.

-Swap plugs around (No change)
-Install new plugs.
-Swap coils around (no different or change in cylinder miss fire)
-Changed injector on cylinder 1 & 2 (originally diagnosed wrong as cylinder 1 by family mechanic)

When the plugs were changed the plug in cylinder 2 was burning white (lean) yet the other plugs were the normal healthy darker colour.

From this, i have done a carbon detox in desperation.

Now my car is still in the garage racking up the money. Today they did a compression test which came back positive and was fine.

i'm now completely lost with what to do. Can someone point me in the right direction? Anything to try?

The car is a 2010 Scirocco 200bhp.

Thank you in advance

[E-bmw]

Well from a quick tot up of what you have moved with respect to what you haven't only really leaves wiring for the plug or the injector, or possibly the ECU plug/wiring.

[GreenV8S]

I don't know that car but from your description I assume it's petrol injection. If you have access to the injector's electrical connection it is easy to test whether the injector is being electrically actuated, and by applying power directly (engine off) you can also hear whether it's moving mechanically. As long as the engine is reasonably quiet, you can also hear the injectors with the engine running and use a mechanic's stethoscope to confirm the suspect injector is opening. If that doesn't show any problem and you still think that cylinder is running lean (very lean, from the sound of it) you may have a blockage in the injector.

[stevieturbo]

Curious as to how someone would diagnose a misfire on the wrong cylinder.....when the ecu will tell you which cylinder is misfiring ?

1 and 2 would be very hard to mix up on any inline 4.

As for people saying listen to the injector etc etc....Is the TSI not a direct injection engine he is talking about ?

So what faults are the ecu reporting ?