How to test for leaky Fuel Injector

3.1L Z · 02-19-2015, 11:45 AM

Per my previous tread:
http://www.e90post.com/forums/showth...hlight=misfire

I was getting misfires on 1-3 cylinders. Problem was the #1 injector only. It was leaking. Is there a DIY on how to manually test an injector to determine which is leaking since the codes indicated all 3 cylinders...

Any suggestions that get beyond the codes and actually get your hands dirty?
Thanks
steve

E92_PINO · 02-19-2015, 11:55 AM

I was told to pull spark plugs and see which ones are wet that would determine a leaking fuel injector,

FYI I just had same issue paid BMW 2800$ to fix and the issue was o2 sensor the whole time... Now they won't replace o2 sensor without extra charge even tho they misdiagnosed it

Myrder · 02-19-2015, 12:15 PM

no codes will say which injector is leaking if one is. Usually you get multiple misfire codes. Anyway as mentioned above pulling the plugs after turning the engine off is the best way. If one is still wet or smells like fuel, that's the one.

02-19-2015, 11:45 AM	#1
3.1L Z Private First Class 28 Rep 186 Posts Drives: '09 E92, Cobb AP Join Date: Jul 2012 Location: San Antonio iTrader: (0)	How to test for leaky Fuel Injector Per my previous tread: http://www.e90post.com/forums/showth...hlight=misfire I was getting misfires on 1-3 cylinders. Problem was the #1 injector only. It was leaking. Is there a DIY on how to manually test an injector to determine which is leaking since the codes indicated all 3 cylinders... Any suggestions that get beyond the codes and actually get your hands dirty? Thanks steve __________________ '11 E92, MSport 3 Pedal 3.1L Stroker Z
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02-19-2015, 11:55 AM	#2
E92_PINO Enlisted Member 3 Rep 44 Posts Drives: E92-N54 Join Date: Jul 2012 Location: Ct iTrader: (0)	I was told to pull spark plugs and see which ones are wet that would determine a leaking fuel injector, FYI I just had same issue paid BMW 2800$ to fix and the issue was o2 sensor the whole time... Now they won't replace o2 sensor without extra charge even tho they misdiagnosed it
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02-19-2015, 12:15 PM	#3
Myrder Major 163 Rep 1,264 Posts Drives: 2010 E92 335i MSport 6MT LMB Join Date: Apr 2013 Location: WildWest iTrader: (1)	no codes will say which injector is leaking if one is. Usually you get multiple misfire codes. Anyway as mentioned above pulling the plugs after turning the engine off is the best way. If one is still wet or smells like fuel, that's the one. __________________ 2010\|335i\|LMB\|E92\|6MT\|MSport\|Logic7\|335is Clutch\|AE Performance\|BMS\|Walbro\|VRSF 7"\| 149.7mph NFZ AZ 1/2mi 1992\|Pontiac Firebird\|Mild 355ci\|T56\| -I will look on your treasures, gypsy. Is this understood?-
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