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Old 09-22-2011, 08:04 AM
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No engine sound on decel

Hi guys, I am just curious as to why sometimes when it's time to start slowing down, and I let off the pedal, the engine goes quiet for a second or two. Then, you hear the "diesel" sound again, just before stopping. I just installed a new cam sensor (IHC#1876736C91), which from the research I did, was supposed to be the best one. And, the results after installing it are great, it sounds a little more quiet, it idles a bit smoother-no more slight romping. And, of course it does'nt stall any more, which was the main reason I changed it. But, I kind of notice that it does that "no sound" thing during decel a little more. Don't get me wrong, the truck is running great, just wondering why it does that. Thanks

Last edited by jtbel; 09-22-2011 at 10:25 AM.
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Old 09-22-2011, 11:23 AM
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lulz thats the injector pump shutting down and the fuel-injectors not firing and saving fuel It's also a built-in engine decelerator; when you let off the throttle the truck automatically utilizes the motor/trans to slow down.

Last edited by 85_305; 09-22-2011 at 11:44 AM.
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Old 09-22-2011, 11:34 AM
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That's perfectly normal. I've had mine go silent for minutes a time when I'm descending dirt roads in the mountains and lose a lot if altitude in a few miles.

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Old 09-22-2011, 11:58 AM
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That's awesome! Just a little curious, I thought the 94-97 trucks did'nt have injector pumps.
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Old 09-22-2011, 01:04 PM
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Well they have HEUI injection... the 'injection system' shuts down, how about that
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Old 09-22-2011, 01:44 PM
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Thanks, I read up on the HEUI injection system. Cool stuff, you got oil and fuel going into different chambers of the injector. Anyway, I guess that is the couple of seconds you get to feel like your in one of those new electric cars that don't make sound. We'd better watch out or they are gonna force us to add a fake sound, like they are trying to do with the electric cars. hehe
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Old 09-22-2011, 05:37 PM
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HEU injection is extremely interesting stuff. Caterpillar actually designed it. It's not the best system for crazy power, but it's extremely reliable.
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Old 09-26-2011, 07:11 PM
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Quote:
Originally Posted by 85_305 View Post
HEU injection is extremely interesting stuff. Caterpillar actually designed it. It's not the best system for crazy power, but it's extremely reliable.
heck yea it is!
I like the fact that you cant run out motor out of oil and seize it up because it will stop firing injectors long before that happens
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Old 09-26-2011, 07:17 PM
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Quote:
Originally Posted by 85_305 View Post
lulz thats the injector pump shutting down and the fuel-injectors not firing and saving fuel It's also a built-in engine decelerator; when you let off the throttle the truck automatically utilizes the motor/trans to slow down.
Theres no injector pump in a powerstroke......
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Old 09-27-2011, 09:27 AM
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Quote:
Originally Posted by Maverick1701 View Post
heck yea it is!
I like the fact that you cant run out motor out of oil and seize it up because it will stop firing injectors long before that happens
thats one of the best things in my opinion! hehe


Quote:
Originally Posted by Jarrod B View Post
Theres no injector pump in a powerstroke......
See my quote that followed that post, below:

Quote:
Originally Posted by 85_305 View Post
Well they have HEUI injection... the 'injection system' shuts down, how about that
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