I have a problem with the engine "breaking down", primarily under load. It has always run great but all of sudden this problem just started. I thought maybe it was old gas, (2 months old). I added approx 15 gallons new gas and 2 cans of Techron Addititive. No change. Changed fuel filter, no help.

The engine is just not running that smooth and then when you increase the throttle a little, you get a hesitation and then a feeling of the engine misfiring/or gas starvation or maybe too much gas. I guess another term is that it just starts lugging. Thought maybe "blowing it out" etc. would help, but that did not either.

I read up on the V-10 a little and feel that it could be a bad plug, injector or coil, but just seems strange that it would just start to happen with no warning. Changing plugs seems like a big deal with these engines so I have not done that.

No engine codes or check engine light.
40,000 miles

Any ideas???

 

It could be any of the three that you mentioned, the plugs are a pain once you get to the passenger side rear ones. I'm actually taking mine down to the dealer tomorrow for them to tell me which coils are bad on mine, because I'm having the same sort of issues. Mine happened all of a sudden as well. one thing I've always had good luck with is Gum-Out fuel injector cleaner. You may also want to check into your fuel filter. Hope this helps!! The people on here have been very helpful for me!

 

If it sat a few months, and then suddenly developed this problem, it sounds like you might have moisture in the spark plug hole. Pull all the COPs, and if the plug boots are dirty or wet, clean them up and reinstall and see if it helps.

Otherwise, a good diagnostics shop will be able to pull the misfire counters and give you a clear indication if it's a random misfire or a single cylinder doing it.

Report back with what you find.

 

Motorhome is back on all 10 Cylinders. It was a COP on the number 1 cylinder. I tried a local garage for diagnostics but they could not show which cylinder was not firing. There were no codes. Tried replacing a COPs with a new one but got frustrated and took it to the dealer. Charge was $250 for new COP, plug, install and diagnostic. Probably not that bad. Also looked at the plug they took out and it is not one of the real long ones. Looks like a regular plug and probably had about 12 threads in the head. (understand some of the older heads only had about 3 threads, hence the blow out problem). Ford recommended replacing the plug as they said that the old one could be fouled up from not firing. Figured I was there, let them have their way. Just glad to have it back running right and back on the road.

 

Is this an F53 or E-series chassis? F-53 I think had the 3-valve like the F-series did in 2005.

However, if it's a "2005" motorhome, built on a 2004 chassis, that would explain it.

$250 ain't bad, actually.

 

Just wanted to know should I be worried or happy with what I have? Believe mine is a 2005 model. It has the transmission that has the tow/haul which I believe only came out in 2005. Again, really don't know anything about it. It is a Class C motocoach.

thanks, if you got the time. Richard

 

I'm no expert, just ride herd on these folks

But, Class C means it's an E-series, 2-valve. It's a VERY proven motor. If you're happy with it's performance, that's all that counts :-X2

This is for 2011, but yours is definitely E-series (Econoline 450, basically).

https://www.fleet.ford.com/showroom/...hure_LoRes.pdf

 

Took the motor coach on a small trip. Engine ran fine for about 125 miles. Stopped and got gas. As soon as I started engine I knew it was mis-firing. I don't think it was gas, as the gas would not have had time to get to the engine. Any ideas what would be causing COP's to go bad, or just bad luck. No codes on engine. Also, is there some type of inexpensive code reader that would show what cylinder is now misfiring. If this is going to be an on going thing, I would like to change the bad ones myself.

Will probably try and make it back home and take back to stealer, but they will probably just say "bad luck, it happens that way sometimes".

thanks, Richard

 

I always thought it was moisture/water getting into the pug wells that caused it to misfire. When I had my '99 V10 after a rain or going through water, I could see water sitting down in the hole in some of the plugs.

I know Ford redesigned the plugs so they wouldn't pop out like they did on the earlier models, but have they done any more to solve the problems with ingnition/coil plug problems? It seems if they would just redesign the hood or something to where water can't creep onto the engine, than that would solve a lot of the problems. I know mine didn't have the protective flaps for the front tires and it would throw water into the engine compartment through there as well. When going through high water, I had to drive real slow.