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Old 07-23-2018, 04:14 PM   #1
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Multiple misfire codes -- feeling nothing

Traveling with the family in a relatively new (2017) Winnebago Vista, when the check engine light comes on flashing, and randomly. Seems to come on at random times, for anywhere from 5 seconds to 3 minutes, and I can't feel a thing different when it comes on (or when it goes back out).



Read out the codes as misfire on cylinders 2, 4, 6, and 8. Can't correlate the misfires to any gas pedal position, load, acceleration, deceleration, anything. And again, I don't notice anything at all when it happens.



Talked to Ford, who suggested I have it towed to a mechanic, which I did, but they've had it for 6 days now and are stumped. Can't seem to replicate it in the shop.



It's under warranty, so I'm not worried about the cost, but I don't like where I see this going. Any idea what might be going on?
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Old 07-23-2018, 05:07 PM   #2
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I doubt you have four cylinders acting up at the same time. These are all on the same side so it is probably a wiring issue.
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Old 07-23-2018, 05:42 PM   #3
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Not on the Ford V10Click image for larger version

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Old 07-23-2018, 06:16 PM   #4
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Didn't know that! I had assumed they were on the same side as well. Thanks for posting.


Still -- can't figure out why the same four would be "misfiring" and the others wouldn't. Gotta be something connecting them, I would think.
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Old 07-23-2018, 06:22 PM   #5
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Not on the Ford V10Attachment 212111
You got me me twinboat. Sometimes the 78 years catch up with me. The bad thing is, I knew this.
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Old 07-23-2018, 07:54 PM   #6
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Just a thought. I would think that most coaches have been fixed by now but just in case.

What year is your chassis? Early 2006 six speed chassis had software that caused a P302 random misfire engine fault code. The fix is to have the new software flashed on the ECM.
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Old 07-23-2018, 09:24 PM   #7
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Just a thought. I would think that most coaches have been fixed by now but just in case.

What year is your chassis? Early 2006 six speed chassis had software that caused a P302 random misfire engine fault code. The fix is to have the new software flashed on the ECM.

It's a 2017. Hope it's that easy of a fix, but I would guess that the Ford mechs would've already tried that by now, and they're still stumped. Plus we also have the P304, 306, and 308 (and 300)
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Old 07-24-2018, 12:13 AM   #8
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It's a 2017. Hope it's that easy of a fix, but I would guess that the Ford mechs would've already tried that by now, and they're still stumped. Plus we also have the P304, 306, and 308 (and 300)

Grasping at straws. I did have a typo. It should say a 2016 6 speed. Not a 2006.
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Old 07-24-2018, 12:16 AM   #9
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Is it still a batch fire motor???

Not up on the V10....
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Old 07-24-2018, 07:46 AM   #10
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Is it still a batch fire motor???

Not up on the V10....

Not certain...
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Old 07-24-2018, 07:52 AM   #11
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Grasping at straws. I did have a typo. It should say a 2016 6 speed. Not a 2006.

Ah, gotcha. I'll ask if they've done the software flash when I call this morning.



Frustrating thing now is that they haven't been able to duplicate it in the shop. Last time I drove it (just before towing), it came on within 5-10 minutes, even with my foot off the gas, so it surprises me that they aren't seeing it.
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Old 07-24-2018, 11:45 AM   #12
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Is it still a batch fire motor???

Not up on the V10....
It's not a bank fired motor.

It's uses Sequential Fuel Injection (SFI), they share 12v but are individually controlled by the PCM on the ground side.

The same goes for the Coil On Plugs.


This is just a SWAG but if the engine is overheating or the PCM thinks it's overheating, it will shut down cylinders.
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Old 07-24-2018, 12:01 PM   #13
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Thanks for thinking about it a bit.


No actual overheating going on, don't know for sure what the sensors are saying.



Ford guys are saying that the misfires were "rich misfires," at least according to the data, and they seem focused on the baro sensor(s). We were between 3500' and 4000' when we got the flashing lights. We had previously been all the way up to 11000' and spent a bunch of time above 7K' and no problems though.


Talked to them this morning and they still can't reproduce it, even after driving around for 10-15 minutes. At this point I'm guessing they're going to cut me loose with nothing done and I'll get it again 30 minutes after I leave the lot.


Ah well.
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Old 07-24-2018, 12:11 PM   #14
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I did a Google search...seems that the coil over plug and plug wires were the issue, some due to getting wet and others due to heat.

Was it raining during or prior to the problem?
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