03 6.0 shakes at idle, low rpms and engine tone change - Ford Powerstroke Diesel Forum
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Old 02-04-2014, 11:18 PM

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03 6.0 shakes at idle, low rpms and engine tone change

Hey guys,

I am new to this forum. I just recently purchased an 03 F-250 6.0 with 230k miles. The truck ran great when I drove it home but then began to shake at low rpms and at idle so I immediately changed the oil, oil filters and ran a fresh tank of diesel in it. Got it changed at the ford dealership so they used ford oil and OEM filters. Batteries checked out good. The problem stopped and then started back up the next day.

Although the truck takes a couple seconds to crank, it runs great until it gets to operating temps. Every time it gets to operating temps, it will suddenly begin to shake at idle, very violently at 1500 rpms around 50 mph, and since It has straight exhaust I can hear a definite change in engine tone. Almost sounds like a gas engine. I can also feel a loss of power. Also, it never smokes.

After reading for days about potential problems, I installed some archoil ar9100 to see if it might have been sticking injectors, but the problem still persists. I installed an SCT tuner and ran the dtc code scanner and it threw codes P006a, p0401, p0403, p0405, p0263, p0284, and p0132b. That seems like a lot of codes. I think it threw the EGR codes because I tried unplugging the EGR valve. I can't seem to think that it's an injector because it's only happening when the truck is warm, there is absolutely no smoke, and it runs strong as hell until that point and sounds great. I have not purchased a scan gauge 2 yet to check all my voltages but will soon. Until then, I need help.

Can anyone think of what this might be? A loose connection on the ficm, loose injector harness, bad EGR?... I am stumped.


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Old 02-05-2014, 04:01 PM

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i had the same prob. about 2 years ago it was a bad head gasket check for pressure in coolant sys when cold (sitting over night ) i think theres a post on here how to check it
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Old 02-06-2014, 04:23 AM
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I know that injectors usually give problems when they are cold, but what you are describing sounds like an injector.

Do you have Autoenginuity or some other scanner? If not, I suggest you get one. It will probably pay for itself with this issue alone.

At any rate, the part where you say that it is really bad at 1500 rpm and 50 mph makes it sound like an injector.

If I had to guess, I would say that you really feel it buck and miss when the torque converter is locking up. Prior to that, you may feel the miss, but it is severely dampened by the torque converter.

My truck used to do the same thing. Start great and then when it got hot it would throw a cylinder and miss at stop lights and sometimes clear out and sometimes just shake the truck to death.

If you can get a decent scan tool, drive it down the road and while it's shaking at 1500 rpm, start turning off injectors one at a time and see if you can isolate it to one or two injectors (My #6 and #1 were bad).
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