2005 6.0 misfire w/ no codes

ajsml · 06-04-2013, 03:33 PM

I've recently been having trouble with my new toy. It happens around 45-65mph after 20min drive, and happens more often on a hill.

It has also shut down the motor after a long drive at slow speeds...

jage · 06-04-2013, 05:18 PM

Fuel filter?
Other fuel filter?

What do you mean by "misfires"?

**BroncoHauler** · 06-04-2013, 05:24 PM

Definitely need more info, but injectors leaps to my mind. Then again, it might be something as simple (though not cheap) as a FICM connector.

Herb

carringb · 06-04-2013, 05:44 PM

I'd be hooking up a supply fuel pressure gauge ASAP. Low supply pressure will cause intermittent mis-fires and/or reduced power, and will damage injectors quickly.

How are looking at the codes? Most code readers only rear "hard" codes. A high-end (Ford, Snap-on, AutoIngenuity) will also see the "soft" or pending codes which the cheap scanners don't have access to.

I would highly recommend running a cylinder contribution test. That will show you if its a problem with a cylinder or cylinders, or something upstream that is affecting all cylinders. Also watch the FICM voltage. If its dropping below 48v, that's your problem (or at least one of them).

ajsml · 06-05-2013, 11:14 PM

Had fuel pressure checked, FICM is in good standing, Checked with the shops ford specific scanners still no codes.

It feels like a transmission lockup, but it doesn't happen all of the time. It happens more frequently with overdrive on, but has happened with it off too.

ajsml · 06-10-2013, 09:24 AM

Dropped the fuel tank, to find out there is very small rubber particles inside the tank. It appears one of the hoses is disintegrating, this is on the 46 gallon fuel cell from smb. Anyone seen this before?

**daveb** · 06-23-2013, 01:42 PM

No, did the stuff make it to the first fuel filter?

I had an issue a year ago similar to yours but the dealership couldn't find a problem (they didn't look in the tank) but I had them replace the first fuel filter even though the test drive went fine before they did anything. The van would cut out like it was being starved for fuel and had a hard time starting but ran fine for the rest of my trip after they looked it over. I've heard of bio-diesel causing problems with certain tanks delaminating but nothing about hoses.

Any update on your situation?