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Old 10-15-2018, 08:24 AM   #1
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No throttle

I have a TC1000 with a 5.9L 24V.
Engine starts and idles but there is not throttle. In other words pressing the accelarator pedal won't do a thing.
Front air reads about 40 psi and rear about 30.
I have not been able to identify any air leaks.

Is there a troubleshooting guide I can follow?
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Old 10-15-2018, 09:10 AM   #2
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Your bus doesn't want to operate below 90-100 psi. if you have an air throttle it may not work until you've achieved operational pressure. You sure won't have brakes that low!
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Old 10-15-2018, 09:19 AM   #3
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Correct. I do believe I have an air throttle.
Should I be checking for air leaks and whether the compressor is building enough pressure? Or are there other checks I should be performing?
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Old 10-15-2018, 11:20 AM   #4
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when you shut your bus off, how fast does your 30-40psi turn to 0psi? if it empties fast you should be looking for leaks. If it stays at 40 for days then the compressor is not doing its job.
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Old 10-15-2018, 11:36 AM   #5
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ok thanks. I am gonna check that.
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Old 10-17-2018, 10:52 AM   #6
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Ok I checked for leaks and couldn't find any.

The air pressure for both front and rear stays at around 30 psi for several hours before slowly dropping. If there is an air leak it is very small.

I checked the air drier and didn't find any leaks there. Same for the rear brake actuators.

What would be the next step? Check the air pressure governor? Whats the procedure for checking that? Do I remove the whole compressor with governor for that?
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Old 10-17-2018, 11:54 AM   #7
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Quote:
Originally Posted by Tomas View Post
Correct. I do believe I have an air throttle.
Should I be checking for air leaks and whether the compressor is building enough pressure? Or are there other checks I should be performing?
My 1999 TC1000 with a 5.9L 24V has an electric "throttle" pedal. But actually diesels don't have a "throttle;" there is never a restriction on the air going in. Only more fuel being added as you need more power. Are you saying the fuel pressure/volume injected into the motor at any given time is regulated by air pressure? I don't believe so. It is controlled with oil pressure.

Perhaps there is a safety feature that won't let you drive if your air is low (if yours is newer than mine) but I doubt it. I would look into the fuel pedal switch or its wiring
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Old 10-17-2018, 01:27 PM   #8
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gnome,


some busses, generally Rear engine busses with non electronic engines had a throttle that was activated by air pressure.. the way it worked is at the pedal you have an air valve that sends air pressure back to a spring loaded actuator.. the mnore air pressure, the more that actuator essentially activated what would have been the throttle cable. if the bus air brake system pressure was not up then the throttle would fail to operate. there should not be an air throttle on a front engine bus..



being electronic this one should be an electronic fly-by-wire.. make sure the wiring connector at your throttle pedal is plugged in securely and that none of the wires have been damaged or cut.. these wires should feed into a harness going to the Engine computer.. be sure the engine computer connectors are secure as well..

-Christopher
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Old 10-17-2018, 01:34 PM   #9
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Not sure how you checked for air leaks.



Can you comment on that as you do have a few leaks I assume from reading this?


A spray bottle of water and dish soap is a priceless tool for chasing down leaks.
Spray down every fitting and every inch of hose, compressor fittings etc. takes some time sure but then you can make a plan to fix.

And it is fun watching the bubbles being blown.


John
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Old 10-17-2018, 01:44 PM   #10
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I only listened for air leaks by crawling under the bus.
There could be air leaks but they are very small. Like I mentioned pressure for both front and rear air tanks remain at a constant 30 psi or so for several hours. Leaks cannot be the reason it's not building pressure.

I believe the accelerator/throttle on the TC2000 and TC1000s are locked unless operating pressure is reached regardless whether it's a front or rear mounted engine. I have front mount and there is an air valve marked "throttle" on the manifold above the tanks on the access hatch by the drivers side of the bus. The line has pressure right now but only 30 psi. I presume once 90 psi or so are reached that it unlocks or activates the accelerator pedal.
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