If you are getting misfires in the same bank with Procede

joec500 · 06-17-2011, 08:32 PM

So I was having this intermittent issue with my V5 where I was getting intermittent mis-fires in bank 2. Misfire in cylinders 4-5-6 and error codes relating to communicating with the bank 2 O2 sensor, but when the Procede was removed the car ran fine.

So after a ton of chasing around this gremlin, I took a closer look at the harness, specifically on the yellow harness, which from I understand, intercepts o2 signals and saw that the wires from the procede to the yellow loom and noticed that they started tearing and were hanging by a few strands of wire, which would explain the intermittent O2 sensor issues. So I re-soldered the wires and re-shrink tubed the wires and everything has been great for the past 1,000 miles.

So if your car is running great stock, but when the procede is installed and you are getting random mis-fires on a single bank, check the yellow loom to make sure all the wires are secure.

thought I would add to the E90post knowledge base

Sparky66 · 06-17-2011, 08:58 PM

Were the wires frayed at the lug crimp?
I can understand if the harness is regularly removed and installed, where continual to and fro cable adjustment can cause fraying of the wires, but I can't see it being a common issue. All the same, your fix for your issue provides great insight and food for thought for people with similar symptoms.

joec500 · 06-17-2011, 09:41 PM

Quote:

Originally Posted by Sparky66

Were the wires frayed at the lug crimp?
I can understand if the harness is regularly removed and installed, where continual to and fro cable adjustment can cause fraying of the wires, but I can't see it being a common issue. All the same, your fix for your issue provides great insight and food for thought for people with similar symptoms.

Yup, this occurred at the lug crimp. I don't think it would be a common issue, but it definitely food for thought, as there could be other issues where the lug crimps to the other harness can come frayed and cause other issue when only the procede is installed.

s2k_335i · 06-17-2011, 10:40 PM

Interesting I never experience this but thanks for the info.

06-17-2011, 08:32 PM	#1
joec500 Brigadier General 125 Rep 3,004 Posts Drives: it has 4 wheels Join Date: Jul 2008 Location: San Francisco iTrader: (10)	If you are getting misfires in the same bank with Procede So I was having this intermittent issue with my V5 where I was getting intermittent mis-fires in bank 2. Misfire in cylinders 4-5-6 and error codes relating to communicating with the bank 2 O2 sensor, but when the Procede was removed the car ran fine. So after a ton of chasing around this gremlin, I took a closer look at the harness, specifically on the yellow harness, which from I understand, intercepts o2 signals and saw that the wires from the procede to the yellow loom and noticed that they started tearing and were hanging by a few strands of wire, which would explain the intermittent O2 sensor issues. So I re-soldered the wires and re-shrink tubed the wires and everything has been great for the past 1,000 miles. So if your car is running great stock, but when the procede is installed and you are getting random mis-fires on a single bank, check the yellow loom to make sure all the wires are secure. thought I would add to the E90post knowledge base
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06-17-2011, 08:58 PM	#2
Sparky66 Major 58 Rep 1,230 Posts Drives: 335 E92 Coupe. Jet Black. Join Date: Feb 2007 Location: Sydney, Australia iTrader: (0)	Were the wires frayed at the lug crimp? I can understand if the harness is regularly removed and installed, where continual to and fro cable adjustment can cause fraying of the wires, but I can't see it being a common issue. All the same, your fix for your issue provides great insight and food for thought for people with similar symptoms. __________________ Sticky is an Idiot
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06-17-2011, 10:40 PM	#4
s2k_335i This is it!! 15 Rep 672 Posts Drives: FBO 335i without meth Join Date: Jul 2010 Location: Land of Freedom iTrader: (1)	Interesting I never experience this but thanks for the info. __________________ DFW, TX. Current: 08' Cayenne GTS, 14' Boxster S, 12' CBR 1000', 04' Bayliner 2556 Sold: 2010 A4, 2008 335i, 2007 335i, 2006 M3, 2006 S2000, 1990 NSX, 1991 300zx, 1992 Supra, 1996 Prelude, 1981 CRX, 1980 Mustang.
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