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      05-16-2020, 06:26 AM   #1
5mall5nail5
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Drives: E34 525i Turbo
Join Date: Oct 2008
Location: PA

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'15 E84 N20 - P0300, P0301, P0302, P0303, P0304 all at once... then fine

Hey all -

Wife went to grab groceries in the E84 last night. We had started the car about 3 hours prior and moved it over in the driveway so I could take another car out. Then she started the E84 and got "Engine Malfunction" and rough running. She shut the car off and started it again - check engine light on but the engine ran fine. She came back inside. I went out, checked under the hood and engine cover for squirrel or other damage (lot of that happening around here) - all good. I start the car, CEL still on, but I rev the engine off idle listening for chain noise or something and its smooth as butter - turbo spool, blow off. Everything sounds find. I grab my OBD2 adapter and check in torque and have:

P0300, P0301, P0302, P0303, P0304 - misfire general, and then each cylinder.

Weird. I did not experience it stumble/run rough - I cleared the code and drove it for 30 mins without issue. Kept Torque app open - it made 16.5 - 17 psi of boost, AFR was down to 12:1 on load and 14.6-15 on cruise. Everything behaving.

Could have been a fluke? I replaced the plugs about 5k miles ago with OE. Car has 65k on it. No obvious issues otherwise.

Thanks!
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