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Smoking AND False MPG Readings
I saw this thread and I felt I needed to give my story as well. I'm still yet to figure this one out. Here is what I have:
2008 F-250, 60k miles, 6.4
Airaid Aid Intake
Downpipe-back 4" exhaust kit (no cat, dpf, or muffler)
Here is my scenario: When I first tuned the truck with the Extreme tune, using mostly the default options, using the Firm(Race) tranny option - I get the same thing you all are talking about. On even gentle acceleration, I get a constant stream of smoke blowing out of my tailpipe. The truck also seems to smoke a good amount while idling, and the turbo goes through a continuous "respool" where every now and then you can hear the turbo spool back up and start hissing again. It does this about every minute.
Secondly, my instrument cluster shows anywhere from 15 to 17 MPG (city driving) and up to 23 MPG (highway driving). HOWEVER, when manually calculating the MPG, I am only getting about 12 city and 16 highway. Extreme is the only tune that this happens with. Performance, Tow, and Stock tunes are all accurate readings on the instrument cluster.
One thing I tried: I set the option for "I have disabled the vehicle's emissions (EGR) system" or whatever it says to YES. I don't have an EGR block kit, but knowing what I know about EGR, I decided to see what it would do.
The results are - I'm getting the typical "puff" of smoke on start, with no smoke during regular acceleration. If I floor it, it pours black smoke. And no more smoking at idle or turbo spooling. Seems normal.
Only problem - when doing this, my MPG doesn't get any better (still about 12 city). I was getting this MPG with a dang filter!
Ford F-250 King Ranch
6.4L Power Stroke Turbo Diesel V8
PERFORMANCE:: SCT LiveWire w/ DPF Delete|| 4" downpipe-back exhaust || Airaid Intake || AutoMeter Cobalt LED Gauges - Turbo/Pyro
Last edited by haywired; 07-28-2010 at 12:34 PM.