1994.5 - 1997 7.3L Power Stroke DieselSPONSORED BY:
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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?
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.
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.
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.
__________________ Mark Former Ford Automatic Transmission Engineer
“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson
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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