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6.2 dead bank

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Old 04-23-2016, 02:13 PM
tfarms4430 tfarms4430 is offline
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6.2 dead bank

Hate to join and ask for help immediately, but most of the guys I know and my experience lies with diesels, but my wife wanted a gas, so here it goes.


2011 F-250 FX4 with the 6.2 obviously 160k


Suddenly started misfiring, like will not even go 35 mph.


genesis says only codes are misfires (5-8), random misfires, that bank's cat system below efficiency (guessing from 4 dead cylinders)


injector cutout makes a diff. on 1-4 and no difference on 5-8


good compression (145-155) on 5-8


new plugs getting spark everywhere


getting fuel (even replaced 2 injectors, fuel sprays while cranking)


seems to be pulling good vaccum that does not drop off like a plugged exhaust


they are missing at all RPM's, will not spin over 3000


cam, rockers, and valvesprings have been inspected, and none appear to be sticking


ECM was sent to my repair guy and tested, he says all is well


wiring harness looks good everywhere, going to try to find a good diagram and pin it out just to be sure


exhaust gets hot, like a late burn maybe


I'm at a loss here, by the way I'm Zach , most of my experience is with heavy diesels (farm equipment, mostly old, we're poor) and older gas engines, and 7.3's


really impressed with the 6.2 pulling (other than gas mileage) until this happened, really do like the truck though, driving my old battle axe 99 with a 7.3 and 300+k gets old, when I have a nice one sitting
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Old 04-23-2016, 10:03 PM
brickman brickman is offline
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Maybe the coils? I had a 5.4 did something similar when a coil went out
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Old 04-23-2016, 11:08 PM
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Could any of this be linked to the notorious wire harness on the e-brake lever?
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Old 04-24-2016, 09:38 AM
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Check the wiring on that bank, which is what you are about to do anyway

All the injectors and COPs are given +12V, you could have an intermittent bad connection.

Other than that, I can't think of anything else that you haven't already covered.
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Old 04-24-2016, 11:04 AM
tfarms4430 tfarms4430 is offline
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what is this magical e-brake harness you speak of?


wiring was my last choice because it seems odd that it would occur all at once, and not be intermittent, and I cannot seem to find a good diagram, (I prefer to ohm wires, as 12v or ground sometimes does not tell the entire story)
But seeing as with work, planting, spraying, and an new clutch in the 1466 the wiring is on the back burner, wiring after a week of 20hr days is beyond me
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Old 04-24-2016, 12:44 PM
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There is some talk about it in this thread:
http://www.ford-trucks.com/forums/13...ont-start.html
It is talked about in other threads too.
I have seen other driveablility problems associated to the pins in the harnesses. My friends 6.7 had one in the dash go bad causing random issues. I'm don't know if this could be linked to your problem but maybe someone else has a better idea. If nothing else, you could look into it a little.
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Old 05-12-2016, 04:36 AM
tfarms4430 tfarms4430 is offline
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I'm at a loss, checked all wiring, all checks out good


even got a couple new coils, no change


we are wondering if maybe a cat collapsed inside, as the one for that bank has big dent in the front of it, the exhaust manifold for that bank gets hot, but I can rest my hand on the pipe downstream of the cat where as the other bank I cannot even hold my hand close


plus to my highly trained ear on cat "rings" when struck with a ratchet, the one with the dent does not


if I get time in the next few days I am just going to cut the !^#@&#%^ pipe and see if it will run, at least I can weld it up if not, getting tired of throwing money at it.
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Old 05-12-2016, 11:12 PM
Jeffrey Robinson Jeffrey Robinson is offline
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Please keep us informed
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Old 05-18-2016, 10:31 AM
tfarms4430 tfarms4430 is offline
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yep, that cat was blown up inside


want to go with high flow aftermarkets.... any reccomendations?


aftermarket seems to be cheaper than eliminating them and getting a new programmer


any other ideas?
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Old 05-18-2016, 12:33 PM
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Do you have a tuner already? Any custom tune it'd be easy to turn off the rear o2's or a SCT can do it with the canned tunes too.

I've got no cats and tuned for it so that would be my vote.


You pulled that cat and the bank fired right up? Or have you run it yet?
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Old 05-18-2016, 10:26 PM
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Quote:
Originally Posted by tfarms4430 View Post
yep, that cat was blown up inside


want to go with high flow aftermarkets.... any reccomendations?


aftermarket seems to be cheaper than eliminating them and getting a new programmer


any other ideas?
I'm glad you found the problem to be a simple one, once you figured it out. An SCT tuners from 5star is about $400. I have never had to deal with new cats before as I used to be a diesel guy. Let us know what you do.
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Old 05-19-2016, 10:34 AM
tfarms4430 tfarms4430 is offline
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talked to the boss, she said get rid of them, less than a year and our roads broke one, nice living where even the county highways are rock


do I just gut the cats or weld in pipe?


programming? I don't really care does not really need more power unless I can keep my wife out of it, what is the easiest option? I am fine with factory codes, just want to shut the rear o2's off
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Old 05-19-2016, 05:40 PM
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You weld in pipe.

You'll need a programmer of some sort to turn off the rear o2's. Don't worry about it giving you 'to much power'. Because unfortunately that's not going to happen.
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