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Old 06-26-2015, 01:06 PM   #12
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Another thought. You do know it wont work if the transmission is in gear or the parking brake is not set. Just checking.... ;) Maybe a safety switch issue.
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Old 06-26-2015, 01:36 PM   #13
Mini-Skoolie
 
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Here is a picture under my bus of what looks like the solenoid operated dump valve like the one link I sent shows. This valve has three air lines one of which goes straight to the air throttle. Thanks allwthrrider for asking the question now I know how the fast idle works and that it wont work for my future plans.
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Old 06-26-2015, 03:38 PM   #14
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Quote:
Originally Posted by opus View Post
Another thought. You do know it wont work if the transmission is in gear or the parking brake is not set. Just checking.... ;) Maybe a safety switch issue.
Checked & checked
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Old 06-26-2015, 05:37 PM   #15
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Ok I do have 2 airlines off the air throttle actuator, one goes to this and the other goes to this,

The first one looks like a solenoid with a dump line & another line that looks like it goes to the front of the bus,

The other is a fitting into the transmission with 2 lines into that it also looks like the red line off the fitting into the trans goes to the front of the bus.

ALSO there's a capped off airline hanging right next to it.

It appears the capped line goes to the front of the bus also
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Old 06-27-2015, 06:03 PM   #16
Mini-Skoolie
 
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OK I am going to summarize what I think is supposed to go on with your fast idle from what I have read. Air is supplied to the throttle pedal through the transmission air modulator to the air throttle. The Air Throttle has a spring that sets at fast idle. After start up air goes to the Air Throttle to set it at normal idle. Flipping on the Fast Idle Switch dumps the air in the Air Throttle so the spring can pull it into fast idle. I didn't
read in my looking around what opus said about different safety switches but I'm sure he's right. Now this is from what I read not my own knowledge but it makes sense to me. One thing I did notice is that in your pictures and your writing is that your air lines are red. Someone in the past must have done some repair with what ever air line color was available. The main concern is the mixing of the two air systems(not a good thing) red is suppose to be only for the emergency braking system. If there is some mixing of the two systems it could explain your issue.
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