2010 bmw e92 (N51 engine) misfire cyl 4

saneamd · 01-20-2019, 07:41 PM

i have a problem if anyone could help me with it.
Code 0029D0
Combustion misfire, Cylinder 4
i changed: new spark-plugs, swap coils, new injectors, done compression test, new cranckshaft sensor
problem persists , idling is really rough and power lost...
can anyone help me?

saneamd · 01-22-2019, 06:15 PM

bump

Basedtiger · 01-24-2019, 12:07 AM

Try cleaning the Vanos solenoids. Which scanner are you using?

saneamd · 01-30-2019, 03:01 PM

i was using the ISTA+ on my laptop.. i cleaned the selenoids, and changed the pcv valve which i found out that was cracked, ... and still today when i open up the engine oil cap it sucks air ....

N52bigblock · 01-30-2019, 06:30 PM

I'd be testing the wiring harness for the coil and injector on cyl 4 back to the DME. Make sure all the earths are good also.

N52bigblock · 01-30-2019, 06:52 PM

Not sure what tools you have available but one way to test for spark if you don't have proper testing equipment is by unplugging and removing the coil from cyl 4, plug it back in and put one of your old s/plugs in the coil, earth the spark plug with a good earth wire and and start the engine. Check to see if you have spark.

saneamd · 02-23-2019, 12:15 PM

Can anyone tell me what the output voltage should be here?

relative4 · 02-23-2019, 02:15 PM

Use a scanner with live data to see the misfire rate. Is it just misfiring frequently, or not firing at all?
Use an inline spark tester between the coil and plug to make sure it's getting spark.
Use a noid light to make sure the injector is getting the firing signal.

Ins_328 · 03-02-2019, 05:56 AM

If you're in one of the states that covered under California emission state law your SULEV n51 covered until 150000/15 years. I don't have the exact list for what parts are covered for e90 but I have one for e46 so they should be the same. So maybe you can just go to dealership so they can tell you if it's covered

01-20-2019, 07:41 PM	#1
saneamd New Member 0 Rep 7 Posts Drives: bmw 335i Join Date: Jul 2013 Location: Moldova iTrader: (0)	2010 bmw e92 (N51 engine) misfire cyl 4 i have a problem if anyone could help me with it. Code 0029D0 Combustion misfire, Cylinder 4 i changed: new spark-plugs, swap coils, new injectors, done compression test, new cranckshaft sensor problem persists , idling is really rough and power lost... can anyone help me?
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01-22-2019, 06:15 PM	#2
saneamd New Member 0 Rep 7 Posts Drives: bmw 335i Join Date: Jul 2013 Location: Moldova iTrader: (0)	bump
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01-24-2019, 12:07 AM	#3
Basedtiger Private First Class 41 Rep 117 Posts Drives: BMW 335i Join Date: Dec 2017 Location: Modesto, CA iTrader: (0)	Try cleaning the Vanos solenoids. Which scanner are you using?
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01-30-2019, 03:01 PM	#4
saneamd New Member 0 Rep 7 Posts Drives: bmw 335i Join Date: Jul 2013 Location: Moldova iTrader: (0)	i was using the ISTA+ on my laptop.. i cleaned the selenoids, and changed the pcv valve which i found out that was cracked, ... and still today when i open up the engine oil cap it sucks air ....
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01-30-2019, 06:30 PM	#5
N52bigblock Second Lieutenant 99 Rep 237 Posts Drives: 2005 E90 330i Join Date: Jan 2019 Location: NZ iTrader: (0)	I'd be testing the wiring harness for the coil and injector on cyl 4 back to the DME. Make sure all the earths are good also.
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01-30-2019, 06:52 PM	#6
N52bigblock Second Lieutenant 99 Rep 237 Posts Drives: 2005 E90 330i Join Date: Jan 2019 Location: NZ iTrader: (0)	Not sure what tools you have available but one way to test for spark if you don't have proper testing equipment is by unplugging and removing the coil from cyl 4, plug it back in and put one of your old s/plugs in the coil, earth the spark plug with a good earth wire and and start the engine. Check to see if you have spark.
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02-23-2019, 12:15 PM	#7
saneamd New Member 0 Rep 7 Posts Drives: bmw 335i Join Date: Jul 2013 Location: Moldova iTrader: (0)	Can anyone tell me what the output voltage should be here? Attached Images
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02-23-2019, 02:15 PM	#8
relative4 Major 611 Rep 1,272 Posts Drives: '08 335xi E90 MT stage 1+ Join Date: Feb 2019 Location: Denver, CO iTrader: (0)	Use a scanner with live data to see the misfire rate. Is it just misfiring frequently, or not firing at all? Use an inline spark tester between the coil and plug to make sure it's getting spark. Use a noid light to make sure the injector is getting the firing signal.
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03-02-2019, 05:56 AM	#9
Ins_328 Private 8 Rep 87 Posts Drives: 328i 2011 Join Date: Feb 2019 Location: Boston iTrader: (0)	If you're in one of the states that covered under California emission state law your SULEV n51 covered until 150000/15 years. I don't have the exact list for what parts are covered for e90 but I have one for e46 so they should be the same. So maybe you can just go to dealership so they can tell you if it's covered
	Appreciate 0 Quote