05 F250 6.0 96K Miles, 1/4 throttle stumble - Ford Powerstroke Diesel Forum
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Old 02-23-2013, 08:51 AM
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05 F250 6.0 96K Miles, 1/4 throttle stumble

Just wanted to pick your brains on my truck.

05 F250 96k and is all stock except for a MBRP Exhaust with no cat. Its pretty much ran ruff and hard to shift when cold for quite awhile. I usually let it warm up for a bit before driving it.

Recently, the truck has developed a stumble while driving say 40mph at 1/4 throttle. The truck stumbles then clears and u can see a puff of blue smoke in the passenger mirror.

stuck injector? Clogged EGR ?

Where to start to try and diagnose ?

TIA !
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Old 02-23-2013, 08:54 AM
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Yes either a stuck injector or egr... Try pulling the egr valve and cleaning it first and see what happens.. If not go to the dealer and get them injectors tested on IDS.
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Old 02-23-2013, 08:56 AM
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Sounds like possible stiction what weight oil you running
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Old 02-23-2013, 09:04 AM
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Valvoline Synthetic 5w40 since 30k miles Awhile back I ran some Rev-X (with no improvment to rough idle on cold start/blue smoke)
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