E90 N52B25

RVG1982 · 02-07-2025, 07:34 PM

So I picked up a beautiful 2006 323i with low kms (170k) for a good deal, since it had a known issue with cylinder 3 misfire. Thinking nothing of it and that I could sort it out for a few hundred bucks I jumped on it....

Man was I wrong!!!!

RVG1982 · 02-07-2025, 07:37 PM

So after noticing that the plug had zero combustion, the troubleshooting began. Swapping coils, plugs, injectors. Nothing changed and the problem stayed at hole 3.

What’s next? Compression test 👀

RVG1982 · 02-07-2025, 07:44 PM

Well that’s NFG…. Hopeful for maybe a broken spring, I pulled the valve cover and to my dismay there was so much varnish and sludge. No broken spring and all the valve train was intact. Scoring on every lobe.

Well now we are getting serious, time to make the call for a junk yard motor????

RVG1982 · 02-07-2025, 07:47 PM

Further tear down required, and inquiry with local yards for a transplant candidate…

Once we got the head pulled ouch, broken exhaust valve 😳 intake cam completely trashed

RVG1982 · 02-07-2025, 07:49 PM

Transplant candidate found 130k kms and clean!

RVG1982 · 02-07-2025, 07:52 PM

Installation went great, thanks to countless post on the forums and of course YouTube 🤣🤣🤣

RVG1982 · 02-07-2025, 07:53 PM

Time for startup and testing

RVG1982 · 02-07-2025, 08:01 PM

Bath time

RVG1982 · 02-07-2025, 08:03 PM

In the end, was it all worth it?

Heck ya, about $3500 all in.

Can’t wait for what’s next. Mods incoming!!!

02-07-2025, 07:34 PM	#1
RVG1982 New Member 0 Rep 12 Posts Drives: BMW E90 Join Date: Feb 2025 Location: Vancouver, BC iTrader: (0)	E90 N52B25 - Misfire Cyl #3 So I picked up a beautiful 2006 323i with low kms (170k) for a good deal, since it had a known issue with cylinder 3 misfire. Thinking nothing of it and that I could sort it out for a few hundred bucks I jumped on it.... Man was I wrong!!!! Attached Images Last edited by RVG1982; 02-07-2025 at 08:25 PM..
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02-07-2025, 07:37 PM	#2
RVG1982 New Member 0 Rep 12 Posts Drives: BMW E90 Join Date: Feb 2025 Location: Vancouver, BC iTrader: (0)	So after noticing that the plug had zero combustion, the troubleshooting began. Swapping coils, plugs, injectors. Nothing changed and the problem stayed at hole 3. What’s next? Compression test 👀 Attached Images
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02-07-2025, 07:44 PM	#3
RVG1982 New Member 0 Rep 12 Posts Drives: BMW E90 Join Date: Feb 2025 Location: Vancouver, BC iTrader: (0)	Well that’s NFG…. Hopeful for maybe a broken spring, I pulled the valve cover and to my dismay there was so much varnish and sludge. No broken spring and all the valve train was intact. Scoring on every lobe. Well now we are getting serious, time to make the call for a junk yard motor???? Attached Images
	Appreciate 0 Quote

02-07-2025, 07:47 PM	#4
RVG1982 New Member 0 Rep 12 Posts Drives: BMW E90 Join Date: Feb 2025 Location: Vancouver, BC iTrader: (0)	Further tear down required, and inquiry with local yards for a transplant candidate… Once we got the head pulled ouch, broken exhaust valve 😳 intake cam completely trashed Attached Images
	Appreciate 0 Quote

02-07-2025, 07:49 PM	#5
RVG1982 New Member 0 Rep 12 Posts Drives: BMW E90 Join Date: Feb 2025 Location: Vancouver, BC iTrader: (0)	Transplant candidate found 130k kms and clean! Attached Images
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02-07-2025, 07:52 PM	#6
RVG1982 New Member 0 Rep 12 Posts Drives: BMW E90 Join Date: Feb 2025 Location: Vancouver, BC iTrader: (0)	Installation went great, thanks to countless post on the forums and of course YouTube 🤣🤣🤣 Attached Images
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02-07-2025, 07:53 PM	#7
RVG1982 New Member 0 Rep 12 Posts Drives: BMW E90 Join Date: Feb 2025 Location: Vancouver, BC iTrader: (0)	Time for startup and testing Attached Images
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02-07-2025, 08:01 PM	#8
RVG1982 New Member 0 Rep 12 Posts Drives: BMW E90 Join Date: Feb 2025 Location: Vancouver, BC iTrader: (0)	Bath time Attached Images
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02-07-2025, 08:03 PM	#9
RVG1982 New Member 0 Rep 12 Posts Drives: BMW E90 Join Date: Feb 2025 Location: Vancouver, BC iTrader: (0)	In the end, was it all worth it? Heck ya, about $3500 all in. Can’t wait for what’s next. Mods incoming!!!
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