Help with 86 F250- sputtering

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Jul 29, 2011 | 07:32 PM

ps4bob

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Joined: Jul 2011

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Help with 86 F250- sputtering

My 1986 fuel-injected 5.0 V8 with dual fuel tanks has been running roung/sputtering/and lacking any power to go above 20mph. I've tried replacing the fuel filter several times and currently have the gas tank off thinking that it might have rust or gunk that is fouling the lines. However the tank inside is super clean.
After replacing the fuel filter it has run well (2 hr trip), but then the sputtering starts again for no apparent reason the next day. This has happened twice. The sputtering action happens when you press the accelerator, the truck jerks and serges and won't go over 20. Any thoughts or suggestions? Pulling the fuel tank was my last resort for a fix and that doesn't seem to be the issue after inspecting it.
Thanks!

Jul 29, 2011 | 07:45 PM

ctubutis

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Joined: Nov 2007

Posts: 22,415

Likes: 92

From: Denver Metro Area, CO

This happens to me on my 1986 DD when the computer goes into Limp Home mode which at least once has been caused by a failed IAC.

Ask the engine's computer what it thinks is happening, here's how:

Ford Fuel Injection » How To Run a Self-Test
Ford Ranger/Bronco II EEC-IV Testing

Jul 29, 2011 | 07:48 PM

85lebaront2

Old School Hot Rodder

Joined: Feb 2006

Posts: 6,472

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From: Exmore, VA

Ok, are all of your pumps running? If you lose the in-tank pumps you will starve it for fuel. he in-tank pumps are fed through the tank selector switch and feed the large canister on the frame just behind the high pressure pump. There is a filter in this canister, it serves as a sump for the high pressure pump and contains the valves to change supply and return lines over.