P0301 missfire code

jayartibee · 09-23-2018, 04:43 PM

e91 525 quite suddenly started running roughly whilst manoeuvring at low speed. Engine light came on soon after and I've read the codes - P0301 (cyl 1 missfire).

Points to coil pack/plug/injector (hope not latter)

Why would this happen so suddenly - rather than intermittently?

BMW FQ · 09-23-2018, 04:52 PM

Maybe because no part works forever? What's your mileage?

arkie6 · 09-23-2018, 09:43 PM

Coils can fail suddenly. Swap #1 coil with another coil and see if the misfire moves to the other cylinder.

jayartibee · 09-24-2018, 01:20 PM

I'll try that. !05K miles

jayartibee · 09-27-2018, 04:15 PM

changed the coil. All good. Running like a sewing machine again. Thanks for advice.

09-23-2018, 04:43 PM	#1
jayartibee Enlisted Member 5 Rep 47 Posts Drives: E91 325i, E87 116i, Jaguar XJ8 Join Date: Oct 2014 Location: UK iTrader: (0)	P0301 missfire code e91 525 quite suddenly started running roughly whilst manoeuvring at low speed. Engine light came on soon after and I've read the codes - P0301 (cyl 1 missfire). Points to coil pack/plug/injector (hope not latter) Why would this happen so suddenly - rather than intermittently?
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09-23-2018, 04:52 PM	#2
BMW FQ New Member 2 Rep 15 Posts Drives: E60 N52B30 Join Date: Sep 2018 Location: Bonn, DE iTrader: (0)	Maybe because no part works forever? What's your mileage?
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09-23-2018, 09:43 PM	#3
arkie6 Lieutenant 397 Rep 433 Posts Drives: 2008 BMW 335i sedan Join Date: Aug 2014 Location: Russellville, AR iTrader: (0) Garage List 2008 BMW 335i [0.00]	Coils can fail suddenly. Swap #1 coil with another coil and see if the misfire moves to the other cylinder.
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09-24-2018, 01:20 PM	#4
jayartibee Enlisted Member 5 Rep 47 Posts Drives: E91 325i, E87 116i, Jaguar XJ8 Join Date: Oct 2014 Location: UK iTrader: (0)	I'll try that. !05K miles
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09-27-2018, 04:15 PM	#5
jayartibee Enlisted Member 5 Rep 47 Posts Drives: E91 325i, E87 116i, Jaguar XJ8 Join Date: Oct 2014 Location: UK iTrader: (0)	changed the coil. All good. Running like a sewing machine again. Thanks for advice.
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