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Old 03-26-2015, 08:09 PM   #1
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Year: 1988
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Engine: 8.3 Cummins
Fast Idle Switch

On my 1988 Crown Rear Eng I have a high Idle Switch but nothing happens when it's activated, would someone have a picture of what the module would look like on the Eng & how they work?

Thanks,, Stuart
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Old 03-26-2015, 08:09 PM   #2
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Oh it's an 8.3 Cummings
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Old 05-23-2015, 01:36 PM   #3
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Sorry about that, not sure what happened. It's in the Cummins forum. Try this. It worked for me.

http://www.skoolie.net/forums/f39/cu...uals-7404.html

The thread link has more details about how best to utilize this site here:
https://quickserve.cummins.com/info/index.html
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Old 06-25-2015, 12:29 PM   #4
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Fast idle

OK this is what I found out. There is a big solenoid attached to an arm on the pump in front of (to the left of) the throttle arm.Switch off the arm is down(first picture), switch on the arm is pulled up.The third picture the arm is down. There is a 3wire plug you can see in the pictures. When I flip the switch it bumps the idle to 1500rpm. Let me know if this helps or if you have anymore questions.
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File Type: jpg IMG_0199.jpg (194.9 KB, 1 views)
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Old 06-25-2015, 12:32 PM   #5
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That looks like the fuel shut off solenoid on my rear engine 8.3 Cummins.

Maybe I got my parts mixed up.

What bus is that pic from?

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Old 06-25-2015, 01:06 PM   #6
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Maybe I have mine mixed up. I'm probably wrong. I need to observe it while someone else flips the switch. Sorry for the bad advise. I'll have to try again.
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Old 06-25-2015, 07:24 PM   #7
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Thanks, I'm at work now won't get home until midnite I'll take a look tomorrow & try to get some good pics of what I have.
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Old 06-25-2015, 10:22 PM   #8
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This is the air throttle:



You are looking at the shutoff.
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Old 06-26-2015, 11:50 AM   #9
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Ok heres what I have. Pretty confident the first pic is the air throttle second pic with push rod extended is off pos. retracted is running pos.

So is it missing another actuator for the fast idle position?
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Old 06-26-2015, 12:40 PM   #10
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Have one of these, used it for a while until I found out how to use the cruise control for idle speed.
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