Coasting Noise??
Lead Driver
Joined: May 2007
Posts: 8,608
Likes: 13
From: Belair md
diesel's are pretty noisy the last time i checked. i'm not following the question? our engines do have a function that when not under load the computer will limit fueling and the motors will get pretty quiet at times. is this what you are asking about?
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Senior User
Joined: Feb 2007
Posts: 409
Likes: 0
From: Nanaimo B.C. Canada
well when i down shift, and let out the clutch and the motor holds back, its silent. theres no diesel knock. then when i stop it starts to idle again or when i rev it up it will make noise. only when im coasting.
Logistics Pro
Joined: Jul 2001
Posts: 4,137
Likes: 41
From: Marble Falls, Texas
Think about it like this.... Jody, DP-Tuner has a tune called drive through. It's all about the timing of the injection. When you let out of the throttle, but the motor is still holding say 2000 rpm. The injection timing is functioning at idle, not 2k. Now weather or not it's advanced or retarded, I couldn't tell you. But this is my best guess as far as an answer. But it is completely normal. Mine does it too.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
No, it isn't timing. It's decel fuel shutoff. When coasting there is no need for fuel, so to get better fuel economy the PCM shuts the fuel off. That's why there is no diesel knock, there is no fuel being burnt.
Post Fiend
Joined: Mar 2007
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From: Johnson City, TN.
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Post Fiend
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From: Johnson City, TN.
Wow I justrealized I hit 4000 posts just now. I think the HP fairy is heading my way. Mater of fact it will be here next weekend.
Clutch and H2E conuntdown: 7 days
Me vewy happy
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Clutch and H2E conuntdown: 7 days
Me vewy happySorry for the hijack, now back to our regularly schedued thread...
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Neal Congrats on 4K! That HP will come soon enough! I cleared the valley of my mock up engine. to start my turbo project but you are gonna beat me to it!
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Fleet Mechanic
Joined: Aug 2007
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From: The boonies by Dallas OR
Fuel injected gassers do the same exact thing.... save for occasional bursts of fuel to keep the cat hot. I'd imagine the new DPF equipped trucks would have to do the same.