2005 E450 Ford V10 intermittent misfires
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โAug-04-2023 06:51 AM
Google searches tells me that it probably needs new plugs to cure this.
I am planning to replace the plugs despite their low mileage although being original. Rig only has 26,000 miles on it. Should I do coils at the same time or just the plugs?
2018 Wrangler JLU - pulling duty as a daily and toad
2012 Audi A7 - daily fun car
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โAug-24-2023 12:49 PM
2001 Suburban 4x4. 6.0L, 4.10 3/4 ton **** 2005 Jayco Jay Flight 27BH **** 1986 Coleman Columbia Popup
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โAug-24-2023 12:34 PM
2018 Wrangler JLU - pulling duty as a daily and toad
2012 Audi A7 - daily fun car
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โAug-21-2023 11:58 AM
katleman wrote:bobndot wrote:
CEL can light-up due to a bad or dirty electrical connection from the ECU to the sensor.
My mechanic always checked that at my service intervals.
And specifically throw only cylinder misfire codes (P0300 & P030X), no other codes?
Weโre talking once a mile or so.
Check and make sure the center bolt holding your harmonic balancer on has not come loose
92 F-250 4x4 460 5spd 4.10LS Prodigy
97 Rustler RT190
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โAug-21-2023 11:08 AM
bobndot wrote:
CEL can light-up due to a bad or dirty electrical connection from the ECU to the sensor.
My mechanic always checked that at my service intervals.
And specifically throw only cylinder misfire codes (P0300 & P030X), no other codes?
Weโre talking once a mile or so.
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โAug-21-2023 07:38 AM
My mechanic always checked that at my service intervals.
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โAug-21-2023 07:30 AM
Your rig is new enough that chaffed wires, corrosion etc are lower on the list of possible causes, but if thereโs any areas on the injector, coils and or main ECM harness you havenโt checked, including unplugging all harnesses and just looking for visual damage to the pins or connections, thatโs where Iโd likely go next.
And itโs not out of line that you may have picked up a furry traveler along the way who likes multicolored licorice (wire insulation) or spent a night or 2 in pack rat country and they snacked on some wires.
If you have camped where it looks like everyone is working on their engines (hoods up), theyโre not. Youโre in packrat country. And those things are pure evil to vehicles and other things.
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โAug-21-2023 07:11 AM
zigzagrv wrote:
Did you check your battery voltage? Had a similar situation once where after I would stop for a short while and when restarted, it would run rough and throw codes till I got up to speed. Turned out battery was bad and till the alternator built up voltage, this would happen. New battery solved the problem.
Battery is new this season, replaced proactively, not out of need.
The codes are thrown at idle, up hills, down hills, doesnโt appear to vary with load.
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โAug-21-2023 06:54 AM
Ron
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โAug-20-2023 10:00 PM
Replaced the air filter as it was filthy. Nope.
At the point its flagging 4 different cylinders, split between the two sides, had a mechanic diagnose it, suggested bad fuel or water. Tossed in SeaFoam and iso Heat. Nope
Refusing to believe itโs the plugs/coils on 4 cylinders, as they are good for 100k miles, tried replacing the MAF sensor. Nope.
Bit the bullet and replaced all the plugs and coils. Nope.
All through this period of misfires, which was flashing the CEL once a mile, no loss of power, no loss of fuel economy, drove just as it always has.
So Iโm heading homeward with the CEL flashing, run out of things to check or replace. Stumped every mechanic I have consulted.
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โAug-13-2023 07:06 AM
Valpo Camper wrote:
Well the saga continues on this and my scanner.
Went and scanned the RV and my scanner will not give me misfire data on the Ford engine. WTH??? Updated software on the scanner and will go back and test again. If all else fails I will try the cowl off in the dark to check. I do not hear a tick but we shall see what gives.
Not sure when your plugs coils and wires were replaced last but it may very well solve your problem even without diagnosing a particular cylinder. AS one coil fails it stresses the rest and in turn they can also misfire. Just replace the coils and plugs and go from there. They probably need replacing anyway. Willing to bet it solves your issue.
Jeff - 2023 FR Sunseeker 2400B MBS
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โAug-13-2023 06:36 AM
Went and scanned the RV and my scanner will not give me misfire data on the Ford engine. WTH??? Updated software on the scanner and will go back and test again. If all else fails I will try the cowl off in the dark to check. I do not hear a tick but we shall see what gives.
2018 Wrangler JLU - pulling duty as a daily and toad
2012 Audi A7 - daily fun car
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โAug-12-2023 12:22 PM
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โAug-09-2023 09:20 PM
Grit dog wrote:
^Yes some reports were loose spark plugs, but how you know if it was actually loose if itโs not connected to the engine anymore. Some would loosen, but I doubt anymore said hey thatโs loose, letโs leave it and see if it blows outโฆ
The root cause of the early 2V engines (not yours) was only 4 threads in the heads. They were revised to 8 threads and that helped quite a bit, but didnโt totally eliminate the problem.
So not a V10, but later model 5.4s in cutaway chassis apparently spit plugs too.
Was talking to my buddy this afternoon he was driving home in his 2015 E350 work van. 100k miles. Spit out its second spark plug. Last one was a few years ago.
Idk if the โnewerโ cutaways still have the old 2V heads or what.
PS heโs a die hard Chevy guy but inherited 3 Ford vans with the company he bought.
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold
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โAug-09-2023 06:48 PM
Good news to me is the Audi has no misfires for quite some time but it is due for plugs soon. No need for coils in it at the moment even despite its advanced miles, 230k miles
2018 Wrangler JLU - pulling duty as a daily and toad
2012 Audi A7 - daily fun car