coasting phenomenon

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May 28, 2005 | 02:29 PM

99bajakid

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coasting phenomenon

I just picked up my 7.3 yesterday, while drive home on the free way every time i would cost going down hill or something my engine would 'stop running' the rpms were up but there was no sound whatsoever, it does this every time im above 30mph or so, so im thinking its normal but damn its an eerie silence. Does anyone know why this happens?

May 28, 2005 | 03:27 PM

Kwikkordead

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From: Rio Rico, AZ.

Quote:

Originally Posted by 99bajakid

Programming strategy. The ECU commands the injectors off when coasting. Saves fuel.

May 28, 2005 | 04:00 PM

99bajakid

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thats along the lines of what i was thinking of. man this truck rules!! i've gotta stop drooling over it long enough to take some pictures of it for you guys.

May 28, 2005 | 09:20 PM

mjwhip2

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From: West Haven, UT

Its kindof a neat sound isn't it? Drive around in one of these noisy rattling beasts then let off the pedal, silence, just the wind. Pretty cool.
Woohoo 700 posts, I need to get a life (oh sorry kwik, 2400 posts.

)

May 28, 2005 | 09:58 PM

Skeeter2221

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From: KENTUCKY

The same thing happen to my PSD the other day. I was hauling my boat to the lake and got behind some road construction. After coasting down a hill the truck cut off and now I know why. Thanks

May 29, 2005 | 01:27 AM

voodoolord

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From: medford oregon

That happened to me once with my old 96 PSD, I put it in neutral and it shut off. I actually had to restart it. Is that what your talking about?

May 29, 2005 | 01:42 AM

Kwikkordead

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From: Rio Rico, AZ.

Quote:

Originally Posted by voodoolord

That happened to me once with my old 96 PSD, I put it in neutral and it shut off. I actually had to restart it. Is that what your talking about?

No, what is being discussed here is the sound, or lack thereof, of the injectors being turned off by the computer when the engine is around 1300 rpm and above and your foot is off the throttle

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May 29, 2005 | 09:07 AM

DaBigTow

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From: Pasco, WA

Seems to me that this could cause your engine to die if, for some reason, the coast system in the tranny didn't work. True?

May 29, 2005 | 11:48 AM

#10

farmb0y

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From: IOWA

Quote:

Originally Posted by DaBigTow

Seems to me that this could cause your engine to die if, for some reason, the coast system in the tranny didn't work. True?

Coast system in the tranny? not sure what that is. But what is being discussed is a "fuel saver" mode for the engine, It can tell if it's pulling a load or coasting, and when it's coasting there is no need to be adding fuel so, as stated, no more, or minimal amounts of fuel are being added, so it's quiet. Once it starts pulling again you're back to normal... pouring the coals to it again as usual.

May 29, 2005 | 03:48 PM

#11

DaBigTow

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From: Pasco, WA

It's the coast clutch solenoid that's activated when not in OD & decelerating

May 30, 2005 | 01:29 PM

#12

99bajakid

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Quote:

Originally Posted by voodoolord

Thats what I thought. That tormented me so bad that I never tried it again

kinda scary going down the sisquyous and realize you dont have power stearing or brakes

i think you might have a problem if it cuts out, and you dont have powersteering or power brakes.. My engine is still 'on' but its just not getting any fuel, therefore the powersteering and power brakes work perfectly while in this fuel efficency mode.. thinggy..