Refill bosch piezo injector12/23/2023 ![]() ![]() Now after the intake cleaning I'm getting both P0171 (bank 1 system too lean) and P0174 consistently. Previously I had an intermittent P0174 bank 2 system too lean code that would come in every few months or so. I got everything cleaned up and put back together and my rough idle on warm restart persists. The intake and valves had a pretty good layer of carbon buildup and I was hoping that was contributing to my rough idle. ![]() While waiting for parts I decided it was time to replace the leaking valve cover and oil filter housing gaskets, block off the PCV ports in the head, install an external PCV system with oil catch can, and clean / walnut blast the intake valves. This condition is becoming more noticeable.Ī month or so ago I had a cylinder #3 misfire that was isolated to the ignition coil (swapped coil #3 with #5 and the misfire moved to cylinder #5). Cold engine starts seem fine, but if the engine is started after being warmed up and after setting 5 to 15 or so minutes, it really stumbles and struggles around 500 RPM for a few seconds, then the speed jumps up to around 1000 RPM and it smooths out, then it settles back down to a normal ~650 RPM. It has always had a bit of a stumble when doing a warm engine start. I bought the car used with ~70,000 miles a couple of years ago and it now has ~105,000 miles. I have a 2008 (build 11/2007) 335i base sedan that is basically stock. ![]()
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