strange problem when accelerating under load

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Aug 13, 2009 | 11:09 PM

wildstang

Thread Starter

VT Chapter Ldr

Joined: Apr 2004

Posts: 96,075

Likes: 294

From: Orange, Vermont

strange problem when accelerating under load

I had problems early last week with the truck running bad, throwing a cel intermittently and stalling when slowing to a stop. I drained the fuel canister, cleaned the fpr screen and new filter which seemed to fix it, which I think may of been water accumulation in the fuel bowl.

Now a different problem started, I pulled our pop up camper up to old orchard maine last saturday and was probably 15 miles from here, out of the 155 mile trip, and it started to sometimes really surge ahead when taking off from a stop but then would cut in and out. By surge I mean feel like it has a lot more power then what it normally has. If I let off and go real easy it would be ok. Even just accelerating quickly with just the truck its self it still is doing it. I am still at the campground here leaving on saturday but would a build up of water do that? It seems to run fine once moving and seems to idle fine? I need to find place to drain the fuel canister agian, hopefully that is it. Maybe the station I filled up at last has a lot of water in their fuel tanks? Any ideas appreciated, thanks.

Aug 14, 2009 | 08:23 AM

DRRXR

Post Fiend

Joined: Feb 2009

Posts: 8,773

Likes: 1

From: Texas Coast

Hmmm

No telling could be a lot of things. I guess you never saw the water in the fuel light come on so I'm thinking its not water. UVCWH may be your issue. How's the oil level? Intermitant surges could also be your fuel pump or even your IPR check to ensure that the IPR doesn't have any bad wires and that the thin set nut is not loose. Just for grins I would add some diesel treat to the fuel and top of the tanks. Let me know what you find.
IPR o-rings could also be a issue.
Here is some reading material.
Rocky
https://www.ford-trucks.com/forums/8...?highlight=uvc
https://www.ford-trucks.com/forums/8...?highlight=uvc
https://www.ford-trucks.com/forums/8...?highlight=uvc
https://www.ford-trucks.com/forums/8...?highlight=uvc
https://www.ford-trucks.com/forums/8...?highlight=uvc
https://www.ford-trucks.com/forums/8...?highlight=uvc
https://www.ford-trucks.com/forums/8...?highlight=uvc
https://www.ford-trucks.com/forums/8...?highlight=uvc
https://www.ford-trucks.com/forums/8...?highlight=uvc
https://www.ford-trucks.com/forums/8...?highlight=uvc

Aug 15, 2009 | 12:16 AM

JethroF250

Posting Guru

Joined: Feb 2008

Posts: 1,354

Likes: 0

by surge do you mean going forward on its own even with the brakes on? if so your tc could be acting up and locking and unlocking. i know when i have mine locked up on the switch it will push through the brakes until it stalls. if the brakes are off it will bog down until up to its desired speed.

Aug 15, 2009 | 09:59 PM

oldbird1965

Fleet Owner

Joined: Aug 2004

Posts: 20,418

Likes: 196

From: AZ

Take a 20oz pop bottle and put it under there, mine would sit right in there and open the value. Its drained and you can also look to see if there is any water in there.

Aug 16, 2009 | 09:57 AM

wildstang

Thread Starter

VT Chapter Ldr

Joined: Apr 2004

Posts: 96,075

Likes: 294

From: Orange, Vermont

I got it home yesterday, I didn't have a good place or time to drain the fuel bowl. The strange thing is when the cel comes on, it seems to staighten out for the most part but the transmission shifts hit hard between shifts, but when the cel goes out the truck runs rough and but the transmission shifts smoothly between gears. Also when the cel is off, and taking off from a start feathering the pedal, it cuts in and out but then if I push it quickly to half throttle it will stop cutting out and go. I did notice once when doing that, there was some black smoke on take off, like it was getting too much fuel. And it did stall at a few stops, but will start right back up.

I am going to drain the canister today now that I am at home into a clear bottle to see if I can see any water.

Thanks for the links DRRXR, I will read through those.

JethroF250 what I mean is when I give it some throttle to go I begins like normal but then feels like it gets some extra power from somewhere, wants to accelerate harder, and then this is when it starts to cut in and out.

Aug 17, 2009 | 05:17 AM

wildstang

Thread Starter

VT Chapter Ldr

Joined: Apr 2004

Posts: 96,075

Likes: 294

From: Orange, Vermont

I drained the fuel canister into a litter soda bottle but didn't see any water in it yesterday. It did run good for about 25 miles, then it started to act up agian. CEL came on and went back out like it had been doing. The search continiues.

Aug 17, 2009 | 06:20 AM

MADVAN

Postmaster

Joined: Feb 2004

Posts: 3,266

Likes: 0

From: Levittown

Pull the fault codes. It could help find the issue.
On another note its possible your issue is air or fuel volume not water.
Check fuel pressure at idle and under load.

Bill

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Aug 17, 2009 | 10:03 AM

CampSpringsJohn

Hotshot

Joined: Dec 2006

Posts: 14,069

Likes: 17

From: Melbourne, Ky

The codes are stored until they are erased. You will likely need to find someone with a scanner that will read these codes. Most scanners at the parts houses don't read the ford trucks properly. Unfortunately at this point all we can do is guess, and you could spend a lot of time and money replacing parts and not fix anything. Cam sensor is a possibility, under valve cover harness, IPR o-rings, let us know what you find out.