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Old 09-04-2008, 07:26 PM
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Coasting Noise??

hey, i just bought a 1995 f250 PSD and i was wondering when you donw shift is the engine supposed to make noise or is it silent?
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Old 09-04-2008, 08:44 PM
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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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Old 09-04-2008, 10:45 PM
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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.
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Old 09-04-2008, 11:26 PM
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Sounds like ya got one of those new fangled Electric/Diesel jobs

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Old 09-05-2008, 12:48 AM
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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.
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Old 09-05-2008, 07:23 AM
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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.
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Old 09-05-2008, 07:52 AM
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Yes it sounds like your diesel is normal.

Electric/Diesel, Kawa you are the bomb.
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Old 09-05-2008, 07:57 AM
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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

Sorry for the hijack, now back to our regularly schedued thread...
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Old 09-05-2008, 10:59 AM
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haha, awsome. thx guys. im going to go out and make some smoke..
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Old 09-05-2008, 11:14 AM
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Does it completely shut off fuel or just limit it to almost nothing?
I've noticed that if i downshift and the engine goes above 1000 rpms, the EGT's will drop to about 200...
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Old 09-05-2008, 05:59 PM
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Quote:
Originally Posted by Neal 97 250 View Post
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

Sorry for the hijack, now back to our regularly schedued thread...
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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Old 09-05-2008, 06:27 PM
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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!
TJ ,, you gots way too many projects any way....
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Old 09-05-2008, 07:01 PM
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Quote:
Originally Posted by secondarychaos View Post
Does it completely shut off fuel or just limit it to almost nothing?
I've noticed that if i downshift and the engine goes above 1000 rpms, the EGT's will drop to about 200...
Nope, no fuel at all above 1200 RPM. You should also note a "light idle" sound between 1200 RPM and actual idle where the engine is powering itself. It sounds noticeably less loud.

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.
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Old 09-05-2008, 07:47 PM
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TJ ,, you gots way too many projects any way....
I consider shop time therapy!! HP is even better though!
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Old 09-05-2008, 10:25 PM
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Therapy... Hmmm I need some therapy
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Old 09-05-2008, 10:25 PM
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