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Default Misfire - 10-21-2017, 02:51 PM

Log attached. Iíve been getting servers codes, but the common theme is misfiring cylinder 4. Changed all the plugs. Swapped coils. Iím guessing itís an injector? Injectors are 2 years old and have about 25k miles in them. Pic of the plug attached as well.
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File Type: csv 2017-10-21 14_10_01.csv (18.1 KB, 140 views)


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Default 10-21-2017, 04:42 PM

If you move plug and coil around and its the same cylinder, then normally its an injector.


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Default 10-22-2017, 06:49 AM


Crap. Swapped plug 4 and 2 and just got a misfire on cylinder 5. As you can see below, itís been all cylinder 4 until now. O2 sensor?

2017-10-18 17_20_55:
2A2C Fuel mixture control 2

2017-10-20 10_28_09:
2A2C Fuel mixture control 2
29E1 Fuel mixture control 2

2017-10-20 17_33_04:
2A2C Fuel mixture control 2
29D0 Misfirings, cylinder 4
29D9 Misfirings in case of tank filling level too low

2017-10-20 20_02_00:
29D0 Misfirings, cylinder 4

2017-10-20 20_02_29:
29D0 Misfirings, cylinder 4

2017-10-21 14_10_14:
30FC Exhaust fume turbo charger, density
29D0 Misfirings, cylinder 4

2017-10-22 08_38_33:
29D1 Misfirings, cylinder 5
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File Type: csv 2017-10-22 08_38_12.csv (17.8 KB, 102 views)


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Default 10-23-2017, 09:28 AM

One more piece of data. I updated to the latest JB4 firmware and did an adaptation reset. Log attached. Codes below.

29D2 Misfirings, cylinder 6
29D0 Misfirings, cylinder 4
29CC Misfirings, several cylinders
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File Type: csv 2017-10-23 08_19_21.csv (17.7 KB, 123 views)


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Default 10-23-2017, 09:02 PM

AFR's look pretty good until you misfire. Maybe an injector or boost leak?



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Default 10-23-2017, 09:59 PM

My $ is on an injector- what index do you have?


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Default 10-24-2017, 12:59 AM

I changed all the injectors 2 years ago. Bought them from rock auto. STANDARD MOTOR PRODUCTS FJ1050. I don’t recall what index they are. They were the latest when I installed them. 12 maybe? I’ve had a misfire on 4, 5, and 6 now. It only happens at WOT. It hasn’t happened with “spirited driving”. Would all the injectors in the second bank start to go at once? Seems odd.


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Default 10-24-2017, 06:53 AM

Found a picture. Definitely 12.


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Default 10-24-2017, 07:17 PM

That is odd, although 2 years & e85 exposure it wouldn’t be out of the question.

I’d pull that bank and see


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Default 10-25-2017, 01:06 AM

Thanks Steve. What am I looking for when I pull the bank?


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Default 10-25-2017, 08:36 PM

Carbon build up, oil, lean condition (grey/white plug), fuel smell, etc.



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Default 10-27-2017, 08:06 PM

I haven’t had a chance to pull the injectors yet. Tomorrow. But, does it make sense that I’m getting 2A2C Fuel mixture control 2 When I start the car? Nothing else.


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Default 10-28-2017, 09:06 PM

Got this code tonight. 29DC Cylinder injection switch-off Could this all be a failing hpfp? 90k miles on the car.


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Default 10-29-2017, 08:46 PM

I had the mixture control code on my old 335- only thing that fixed it was new injectors tbh.


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Default 10-30-2017, 07:32 AM

Thanks Dave. I like the sound of replacing injectors vs. a HPFP....


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Default 11-04-2017, 07:40 PM

Stumped again... New log attached. I put new injectors in cylinders 4, 5, and 6. The old ones didn't look great, but I am seeing the same behavior. To recap, I've changed the plugs and moved some coils from Bank 1 to Bank2 prior to this. Any other ideas?

Similar codes from the run associated with the log.
29D1 Misfiring, cylinder 5
29D2 Misfiring, cylinder 6
29D0 Misfiring, cylinder 4
29CC Misfiring, several cylinders

Thanks.
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Default 11-05-2017, 10:30 AM

One more thing. With just normal driving I’m still getting 2A2C Fuel mixture control 2. The misfiring is only at wot.


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Default 11-05-2017, 08:15 PM

2A2C still occurring is an issue you'll have to get resolved. O2 sensor, boost leak, ???



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Default 11-05-2017, 08:26 PM

I guess I’ll start with the o2 sensor. Seems like that might explain the fuel mixture issue and the misfires. I would guess a boost leak might not just isolate misfires to Bank 2.


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Default 11-05-2017, 08:35 PM

If it's an intake manifold gasket or exhaust leak it would.



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Default 11-06-2017, 07:06 AM

That makes sense. O2 sensor sounds like an easier start. ;-)


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Default 11-06-2017, 11:27 PM

How does the car idle?


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Default 11-07-2017, 12:18 AM

Car idles ok. Not nearly as rough as it did before I cashed the plugs. What are you thinking?


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Default 11-08-2017, 12:32 AM

A dying o2 can make idle a bit rough.


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Default 11-27-2017, 09:50 AM

Finally got around to changing the O2 sensor. That seems to have fixed it! Thanks for the help.


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