E90 /52 No Compression Cylinder 6 (help!!!!!)

Rob27e · 03-02-2017, 10:08 PM

Hi was looking to get some feed back. I have a 2006 e90 330i. I had a mechanic come and i spect the vehicle because car was shacking , vibrating and have to give it gas to to stay on. Code read p0306 misfire cylinder 6. Changed coils and spark plugs, no change. Mechanic co conducted a compression test and @ 0 tested 5 just to make sure and all was good .. So this is were i need the feedback i know now that its internal. Mechanic said i would need an engine swap because if its the valves they cannot be worked on or replaced, is there any truth to this?? As it is a bmw . I know u can have the valve replaced or straightened on other vehiclws. I know i sound naive ,but im not too mechanical inclined, would like to get some options based on people who know the car . Thanks

Flyboy161 · 03-02-2017, 10:42 PM

I think you need to find another mechanic

alfazrus · 03-03-2017, 02:46 AM

First, I would make sure all the coils seated tight, can be a little tricky. Put a little oil in the spark plug hole of the suspected cylinder and perform another compression test. If you see a jump in reading, then it's your rings. If not , you may have valve problem.

mxchris727 · 03-03-2017, 08:28 AM

He should perform a leak-down test rather than a compression test. Get a new mechanic.

Carloespo · 03-03-2017, 10:03 AM

I agree with making sure everything is plugged in proper. I had the same code/ same situation. Except that I was the one doing the diagnosis myself, in a hotel parking lot. I purchased a coil pack from the first available place as I was on the road for work,.. Autozone. I replaced the coil, no change, changed the plug, no change. Even had myself convinced for a minute that it was a faulty O² sensor. A co-worker, who was holding my beer while I tinkered, noticed that the coil wasn't properly seated. The clip shut fully but there was still a 1/16" gap between the coil and plug. Upon further inspection we realized that the coil didn't have the proper female connector. There is a slot in the middle of the male connector that needs to line up with a raised ridge on the female end of the coil connector. The coil I purchased had the raised rib slightly offset, never allowing it to fully seat. Surprise!,.. AutoZone sold me the wrong part again. Hardly noticeable but definitely the problem. Went to O'Reilly after the zone gave me a hassle about returning it and they sold me one for iirc, $63 and a lifetime warranty.
People miss things, I looked right past this obvious obstruction for well over an hour. Hopefully it's something as simple as this for you.

BTW, the beer was a Budweiser if that helps too.

Efthreeoh · 03-04-2017, 06:08 AM

A bad fuel injector will trigger a misfire code as well. I'd get a second opinion on the dead cylinder.

Rob27e · 03-06-2017, 10:45 PM

Just An Update , Valve Cover Was Removed And One Of The Valves Was Bent In Cylinder 6,thankfully Only One. Was Also Told That A FauLty Eccentric Sensor May Have Been The Cause. Thanks For The Feedback

03-02-2017, 10:08 PM	#1
Rob27e Enlisted Member 2 Rep 33 Posts Drives: E90 2006 330i Sedan N52 Join Date: Nov 2016 Location: San diego, california iTrader: (0)	E90 /52 No Compression Cylinder 6 (help!!!!!) Hi was looking to get some feed back. I have a 2006 e90 330i. I had a mechanic come and i spect the vehicle because car was shacking , vibrating and have to give it gas to to stay on. Code read p0306 misfire cylinder 6. Changed coils and spark plugs, no change. Mechanic co conducted a compression test and @ 0 tested 5 just to make sure and all was good .. So this is were i need the feedback i know now that its internal. Mechanic said i would need an engine swap because if its the valves they cannot be worked on or replaced, is there any truth to this?? As it is a bmw . I know u can have the valve replaced or straightened on other vehiclws. I know i sound naive ,but im not too mechanical inclined, would like to get some options based on people who know the car . Thanks
	Appreciate 0 Tweet Quote

03-02-2017, 10:42 PM	#2
Flyboy161 Second Lieutenant 274 Rep 293 Posts Drives: 2008 E93 M3 Join Date: Apr 2014 Location: Perry, GA iTrader: (0) Garage List 2008 BMW M3 [0.00] 2012 BMW E92 335i [0.00]	I think you need to find another mechanic
	Appreciate 2 STR8-6IX536.00 335udm52.50 Quote

03-03-2017, 02:46 AM	#3
alfazrus First Lieutenant 101 Rep 308 Posts Drives: 2006 e90 330i Join Date: Oct 2012 Location: DC iTrader: (2)	First, I would make sure all the coils seated tight, can be a little tricky. Put a little oil in the spark plug hole of the suspected cylinder and perform another compression test. If you see a jump in reading, then it's your rings. If not , you may have valve problem.
	Appreciate 0 Quote

03-03-2017, 08:28 AM	#4
mxchris727 Captain 193 Rep 666 Posts Drives: '03 M5, '06 325i, '12 M3 Join Date: Aug 2012 Location: Westport, CT iTrader: (0)	He should perform a leak-down test rather than a compression test. Get a new mechanic. __________________ BMW GT1 (INPA, DIS, WinKFP, ect..), ISTA/P & /D is up and running! PM me if you want to stop by and code your car.
	Appreciate 0 Quote

03-03-2017, 10:03 AM	#5
Carloespo New Member 0 Rep 12 Posts Drives: 2006 black 325i Join Date: Aug 2016 Location: Charlotte, Nc iTrader: (0)	I agree with making sure everything is plugged in proper. I had the same code/ same situation. Except that I was the one doing the diagnosis myself, in a hotel parking lot. I purchased a coil pack from the first available place as I was on the road for work,.. Autozone. I replaced the coil, no change, changed the plug, no change. Even had myself convinced for a minute that it was a faulty O² sensor. A co-worker, who was holding my beer while I tinkered, noticed that the coil wasn't properly seated. The clip shut fully but there was still a 1/16" gap between the coil and plug. Upon further inspection we realized that the coil didn't have the proper female connector. There is a slot in the middle of the male connector that needs to line up with a raised ridge on the female end of the coil connector. The coil I purchased had the raised rib slightly offset, never allowing it to fully seat. Surprise!,.. AutoZone sold me the wrong part again. Hardly noticeable but definitely the problem. Went to O'Reilly after the zone gave me a hassle about returning it and they sold me one for iirc, $63 and a lifetime warranty. People miss things, I looked right past this obvious obstruction for well over an hour. Hopefully it's something as simple as this for you. BTW, the beer was a Budweiser if that helps too.
	Appreciate 0 Quote

03-04-2017, 06:08 AM	#6
Efthreeoh General 17314 Rep 18,737 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Virginia iTrader: (0)	A bad fuel injector will trigger a misfire code as well. I'd get a second opinion on the dead cylinder. __________________ A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
	Appreciate 0 Quote

03-06-2017, 10:45 PM	#7
Rob27e Enlisted Member 2 Rep 33 Posts Drives: E90 2006 330i Sedan N52 Join Date: Nov 2016 Location: San diego, california iTrader: (0)	Just An Update , Valve Cover Was Removed And One Of The Valves Was Bent In Cylinder 6,thankfully Only One. Was Also Told That A FauLty Eccentric Sensor May Have Been The Cause. Thanks For The Feedback
	Appreciate 0 Quote