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Old 09-28-2013, 10:55 AM
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Chug and Smoke

Hello,

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.

Thanks,
Andrew
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Old 09-29-2013, 10:35 AM
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If you unplug the wires going into the turbo then try driving it, does it emulate the problem? You may want to consider cleaning the turbo. Maybe the vanes are getting stuck? These trucks require that you "drive it like you stole it" periodically to prevent the turbo vanes from sticking.
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Old 09-30-2013, 10:17 AM
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Interesting Idea

Quote:
Originally Posted by Beauxroux View Post
If you unplug the wires going into the turbo then try driving it, does it emulate the problem? You may want to consider cleaning the turbo. Maybe the vanes are getting stuck? These trucks require that you "drive it like you stole it" periodically to prevent the turbo vanes from sticking.
I'll definitely give this a shot. I was told the turbo was examined and cleaned at the time I had the EGR deleted because the initial diagnosis of the problems leading up to the EGR delete indicated possible problems with the turbo (the dealer said a trouble code related to the turbo had been logged and was recommending a new turbo). I didn't trust that evaluation and took it to another shop who also felt that was bogus. To be safe though they said they'd clean and inspect it just to be sure. It hasn't logged any trouble codes (turbo or otherwise) since the EGR delete so I'd hoped we'd fixed everything (the white smoke certainly hasn't come back). I'll report back what I find. Thanks again.
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Old 09-30-2013, 01:53 PM
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I have a feeling they didn't actually take the turbo apart and clean it
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