09-28-2013, 09:55 AM
Join Date: Jul 2009
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Chug and Smoke
I'm hoping someone can help me out with a drivability problem my truck developed over the last few months. I have an '06 F250 SuperDuty. I've upgraded the exhaust and intake, have done an EGR delete (bulletproof) with a new oil cooler, and have tuned it with the performance tune from an SCT SF3. The truck ran stable in this configuration for over a year until this problem surfaced a few months back.
The symptoms of the problem are as follows: after hard acceleration (sustained climbs on Colorado mountain passes, freeway entrance ramps, etc.), the truck will start to blow a lot of smoke. I'm not talking about smoke during the hard acceleration, but rather heavy smoke under light throttle immediately after it. The problem is worse at altitude and is accompanied by a significant loss of power. Normal cruising is fine (normal power output, minimal smoke), but when the engine is in this problem condition, driving can be difficult as the engine chugs along belching out smoke and is barely able to climb hills. In this condition, if I get the speed up enough to where the turbo spools again, the problem will disappear until I let off the throttle and the turbo winds back down to cruise level at which point the smoke and chugging return. The truck will eventually right itself at cruise and will drive fine until the next hard acceleration when all the symptoms return.
I've noticed the problem is worse in the final drive gear, though that may simply be due to the added torque demands of that gear ratio when climbing. I also believe the problem is more acute at altitudes above 7000'.
I'm not hard on my truck. Limited towing. No drag strip. I've not upgraded any fuel system components for fear of over taxing the notoriously weak head studs.
At some point over the last two years, the FICM module blew (on I70 at 75MPH fully loaded and bound for Moab...not the best day of my life) and I had it replaced. Apart from that I've only had unrelated problems (death wobble).
I checked for trouble codes and there are none.
Clean Diesel additive gives me a slight performance boost, but doesn't stop this problem from happening.
Anyone have any ideas? Any help would be greatly appreciated.