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Old 05-11-2006, 11:10 AM   #21
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F350 diesel / automatic

My truck threw a code and my "check engine" light came on yesterday. Took it to the dealer this morning, and they replaced the EGR valve under warranty.

I've driven it twice since then, and the tranny upshifts sooner than before. I can actually get into top geat at ~40 mph, where 45-50 was needed before. This should improve my mileage. I'll keep you posted.
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Old 05-11-2006, 03:10 PM   #22
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Re: F350 diesel / automatic

Quote:
Originally Posted by Sludgy
My truck threw a code and my "check engine" light came on yesterday. Took it to the dealer this morning, and they replaced the EGR valve under warranty.

I've driven it twice since then, and the tranny upshifts sooner than before. I can actually get into top geat at ~40 mph, where 45-50 was needed before. This should improve my mileage. I'll keep you posted.
I'm guessing that the ECU was probably reset in the process and effects the shift pattern. At any rate, a new EGR could be the ticket to better mileage as well.
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Old 10-14-2006, 06:16 PM   #23
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Keep the i-c

Bypassing the turbo diesel's intercooler is counter productive to fuel efficiency increases. Hot air can expand only so much, cold air can expand more.
Unlike most gasoline powered engines where hotter air will keep the air/fuel mix from coalescing prior to ignition, thus increasing burn efficiency enough to offset the loss of thermal expansion in a hotter air charge, a diesel has no fuel in the air until injection-ignition. A colder air charge is therefore preferable in a diesel due to the greater percent of expansion possible. Greater expansion pressure from the same fuel. Same pressure from less fuel.
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