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Old 11-29-2011, 03:39 PM   #12 (permalink)
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Join Date: May 2009
Location: Charlotte NC / York SC
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05 DMax - '05 Chevrolet 2500HD
90 day: 18.48 mpg (US)
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Originally Posted by UFO View Post
I have done extensive searching and reading on Fred's site. No one has done due diligence in demonstrating fuel mileage changes with EGR removal. This should involve imitating the conditions of EGR to the computer so it makes no changes in how it fuels the engine -- when the CEL is lit, the ECM will retard the timing to avoid the creation of NOx and mileage will decrease.

To answer your question, I want to convince myself removing EGR improves engine efficiency. I hypothesize it will, and I want to demonstrate it in fact, with as much control over the experiment as I can get.

And secondarily, to keep the intake from clogging. Many on Fred's site make the claim the newer diesel fuels will keep this from happening. I pulled my intake and cleaned it two years ago, and it was a mess. I may do it again in the spring and see if there is appreciable buildup. I am not sure the new diesel fuels are any different in that regard. And I also don't believe you can remove enough of the oil in the intake to prevent the crud from sticking; if there is a fuel efficiency gain from removing EGR, that is the better solution for me.
Many on Freds site don't get CELs as they defeated the EGR through software. They still get nasty intakes.
My 94' doesn't send crankcase vapors through the intake, light coating of powder. It ran for years on regular "high sulpher" diesel.

Again YMMV

I can't understand why my MPG's are so low..........
21,000lb, 41' Toy Haulers are rough on FE!
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