Idle falloff
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Freshman User
Joined: Feb 2013
Posts: 46
Likes: 0
From: Haines, AK
Idle falloff
Is it normal for my engine to quit firing during deceleration? When I hang on the compression down a grade or approach a stop sign there's a quiet, whirring engine noise, until I either press on the accelerator pedal again or I go just a few miles an hour. It then picks up to the normal, delightfully diesel idle. It's never died, or come close to it in this scenario.
I often drive a Chevy diesel at work, and it operates very differently - is this typical for a PSD?
I often drive a Chevy diesel at work, and it operates very differently - is this typical for a PSD?
Cargo Master
Joined: Feb 2009
Posts: 2,111
Likes: 0
From: Yreka, CA
I dont believe what he's saying is the motor stops running. Both my 6.0l and 7.3l do what he's describing.
When coasting down a hill it's as if the motor goes silent until you put power back to it. I dont have an explanation. Just trying to clarify.
When coasting down a hill it's as if the motor goes silent until you put power back to it. I dont have an explanation. Just trying to clarify.
Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
That's normal. Every 7.3 I have ever driven does that. When you're rolling along and off the throttle it more or less shuts the fuel off and just lets the engine spin. One of the benefits of electronic injection.
Hotshot
Joined: Dec 2005
Posts: 14,377
Likes: 609
From: evansville in
Dmaxes are weird after driving my obs.darn things do not coast at all.if u wanna move.u give throttle. and yea!
obs is quiet on decel.normal
obs is quiet on decel.normal
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Posting Guru
Joined: Aug 2004
Posts: 2,417
Likes: 4
From: Braham MN
Supposedly they completely stop firing the injectors when the IVS is closed but the RPM is above 800 RPM's. I have no way to verify this just what I was told years ago.
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Post Fiend
Joined: Dec 2010
Posts: 10,121
Likes: 3
From: Orrville, Ohio
That would seem to be the case with mine as the injectors go completely silent when you're coasting.
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