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post #1 of 4 Old 07-16-2012, 02:06 PM Thread Starter
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I found a 99 F250 that I want to have as a beater... especially since my 6.0 left me walking until I get her fixed. Guys out of work, needs money fast and wants to sell me his truck. Truck looks sweet, 2 door short bed, custom rims. Only thing is the truck starts, runs great, but then shuts back off. Pulled codes, says misfire in cylinders 1,3,6 and two codes for fuel system to lean. He said that a Ford tech told him it was the ECM that was bad. I'm thinking that if the ECM was bad the truck wouldn't run let alone start. I'm thinking a sensor??? What do you all think? He only wants $500 for the truck, even if I have to dump a grand into it its still worth it to me. Hopeful that the 6.0 will be back on the road by October or November.

EDIT: should have added that its a 5.4 triton engine. DUH... lol.
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post #2 of 4 Old 07-17-2012, 10:33 AM
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Go for it. When was the last time the plugs, COP's and boots were changed? I would also check the fuel filter to see if it's plugged.

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post #3 of 4 Old 07-22-2012, 07:00 PM
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If it starts then I doubt the COPs are bad (does it even have COPs? I thought 99 was still using coil packs... [Edit: just checked, it does have COPs]). The gas engines start with a baseline program that's stored in the computer. After a few seconds of running they start looking at sensors like the O2 sensor to fine tune the fuel mixture. I would pull the plugs one at a time and compare them to this chart. Also recommend a compression check while in there.

My guess is the computer may be bad, but it's more likely you have a damaged wire harness or a leak in the intake or exhaust manifold, which is causing the engine to lean. Pull the spark plugs if they look like the engine is getting too much fuel then the leak is in the exhaust side, and the computer is adding too much fuel to compensate. if they look normal or lean then the leak would be on the intake side. If the harness is damaged, that gets tougher. You could pull the engine harness and inspect all of it for damage or grab a junkyard harness and hope it works.

For $500 bucks I would jump in with both feet! Worst case grab a junkyard computer and try swapping that in. Check for air leaks, maybe get a new engine/EFI harness. Good luck!

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post #4 of 4 Old 08-05-2012, 04:17 PM Thread Starter
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Okay guys here is an update. Still got the miss. As far as the system to lean one of the rubber hoses had a hole in it. Replaced that and no more codes for that. Changed out the O2 sensors and the Camshaft position sensor and replaced the fuel filter. Also replaced 2 COP that looks shady and changed the spark plugs. One of the plugs looked like it was not firing, the others looked REAL DIRTY. After the 2 new COP and plugs I pulled each wire harness off of the COP to see if I could get the engine to die down to see if they were firing. Everyone of them passed that test. So now I'm back at square one. Truck runs fine at idle with just a few pops in the exhaust until she calms down. Then about 15 seconds in the RPM's fall off a bit and she runs around 6 to 700 RPM and sounds choppy and ruff. Give the skinny pedal a tap and she clears up. On the road if you stay out of the throtle she has a miss but still goes ok, if you get into the gas she sounds like she floods up real bad. Anymore ideas?

EDIT: I also changed the fuel filter as well. Could it be something in the ECM itself or maybe an injector problem???
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