P0305

Richbot · 11-14-2012, 10:06 PM

One for the archives and searchers -

Car threw a P0305 code (misfire detected on Cylinder #5) a couple weeks ago at around 41,500 miles. With a weather change I thought it might have been a random code (first code the car has thrown since new) so I reset it and moved on.

10 days later code came back, with reduced power (4500 redline) and rough running. Both instances were at relatively light load (38% on TPS on snapshot data) at highway speeds. A restart cured the reduced power but did not clear the SES. Took to dealer and #5 cyl. coil was found bulged, was replaced along with the spark plug, and now all is well. The dealer did what I would have done first, except I would have had to go through the extra step of moving the coil to see if the fault moved with the coil and they were able to confirm it was bad with their diags.

THE TECH · 11-15-2012, 10:54 AM

Thanks for posting it Rich.

11-14-2012, 10:06 PM	#1
Richbot Brigadier General 365 Rep 3,340 Posts Drives: Jerez Black E90 Join Date: Sep 2007 Location: STL iTrader: (3)	P0305 One for the archives and searchers - Car threw a P0305 code (misfire detected on Cylinder #5) a couple weeks ago at around 41,500 miles. With a weather change I thought it might have been a random code (first code the car has thrown since new) so I reset it and moved on. 10 days later code came back, with reduced power (4500 redline) and rough running. Both instances were at relatively light load (38% on TPS on snapshot data) at highway speeds. A restart cured the reduced power but did not clear the SES. Took to dealer and #5 cyl. coil was found bulged, was replaced along with the spark plug, and now all is well. The dealer did what I would have done first, except I would have had to go through the extra step of moving the coil to see if the fault moved with the coil and they were able to confirm it was bad with their diags. __________________
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11-15-2012, 10:54 AM	#2
THE TECH BimmerPost Supporting Vendor 201 Rep 13,110 Posts Drives: BPMsport 2012 E92 M3 Join Date: Jun 2011 Location: Kansas iTrader: (45) Garage List 2014 Honda Grom [0.00] 2012 Honda Ruckus [0.00] 2005 Chevy Silverad ... [0.00] 1995 Toyota Supra [0.00]	Thanks for posting it Rich.
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