Quote:
Originally Posted by Danishp97
Hi, history is that the previous owner never used to rip it etc. he would occasionally put a lower grade of fuel even after the tune. So what I did is change injector and coils. Car was driving absolutely fine
Even after changing the rails. This issue only start once the injector 8 started to leak fuel from top and car started to reek of gas smell. So we installed one old injector temporarily until replacement came. After installing the old injector too the car was driving fine until same night it started to misfire like my video i have attached. So then I chose not to drive it until replacement came. After installing the replacement injector too this misfire at idle is still there. When you scan the misfire counter shows 0. If you run cylinder roughness test it shows cyl 6 running rough. So we switched coils and plugs over from cyl 5. Still the same no luck no improvement. However the car is making proper boost drives proper pulls like a train. ONLY at idle is this popping noise from exhaust and vibration and hiccup. I even clocked 280km/hr last night without any hiccups.
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Did you ever figure this out? Ironically enough, I now have a problem with cylinder 6 misfiring on my 2013 650i..
My injectors, coils, spark plugs and HPFPs are all new yet I get misfires on cylinder 6 at cruise speed of around 105 KMPH. Above and below that speed, it goes away. In sport mode doesn't misfire. Also get some misfires after shifting from 2-3 and 3-4.
Another weird thing is all my misfires go away if I disconnect the MAF sensors. MAF sensors are brand new though..
I've switched around everything and it still stays in cylinder 6. Compression on all cylinders is good and around 210 psi average. Highest being 217 psi and lowest 205 psi.
I've seen an airmass plausibility code A few times but I've smoke tested for leaks and nothing showed up.