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Old 01-08-2018, 03:44 PM   #1
Mini-Skoolie
 
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Bus wouldnít start, bypassed ignition now wonít go faster than about 10mph?

I havenít seen any posts with this problem yet, I might also have to try this one myself. Iím gonna give the whole story just in case any of it is related to the new problem.

We pulled into a repair shop after the air stopped working. We werenít losing air( only when braking) it just wasnít filling back up. While on that drive I pushed a few buttons on the panel looking for flashers.

The next morning we tried to start to pull into a repair bay and got nothing from turning the key. We had power to the dash tho.

They ended up towing it in, replacing a governer on the air, and bypassing the ignition to a push button.

Now I canít get out of first gear. Any advice is greeaatly appreciated

94 bluebird international/navi


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Old 01-08-2018, 05:22 PM   #2
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Is push button across the starter solenoid?
Your starter solenoid could also have other wires attached that send a signal out to different control modules like the ignition control module or an ECM that is looking for some kind of info. It isn't getting.
Are your RPM getting up enough to shift and your speed not getting there or are you rolling along good and revving up enough RPM and it's just not shifting.
On the older non computer stuff there is not much connected to the starter solenoid but on the electronic stuff I can't help that much. Other than ask questions to help trouble shoot.
If you answer the question about the RPM and speed thing then I have an idea about that but it has nothing to do with the non start condition.
But you can find the starter solenoid and tap on it with a decent weight wrench or small hammer while turning the key switch and see if it kicks in. If so the solenoid is bad. If they wired the push button across the solenoid and the starter works but not other things wired to it then the solenoid is probably bad.
Others with more experience on your specific engine should be along Farely soon with better advice.
Good luck
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Old 01-08-2018, 05:35 PM   #3
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with the ignition bypassed the ECM very well may not know the bus is turned on.. or may not have power to the proper relays... the ECM expects certain inputs to be high and then will trip the power and starter enable relays which allow the key switch to start it... you likely blew a fuse, or tripped an interlock of some sort..
-Christopher
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Old 01-08-2018, 06:10 PM   #4
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Just for my knowledge Chris. Doesn't even a computer controlled bus still have a dedicated starter solenoid?
I have asked the OP some questions that haven't been answered yet about there RPM and actual speed
They said the shop replaced a governor in the air brakes and I wanted to make sure they didn't still have a brake or brakes not releasing all the way. Maybe locked up by a bad governor or vice-versa?
And put a starter push button in? Wht did they wire the button across?
I ain't a computer man but I try to edgemucate myself when I don't know?
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Old 01-08-2018, 06:12 PM   #5
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Quote:
Originally Posted by Jolly Roger bus 223 View Post
Is push button across the starter solenoid?

.

Are your RPM getting up enough to shift and your speed not getting there or are you rolling along good and revving up enough RPM and it's just not shifting.



Thanks so much for the info already! Everything helps, Iím sure you all know.
I thought the rpms weíre getting high enough to change but now that I think about it Iím not sure. There was a moment where it switched gears while going a little faster down a hill but we pulled into the Walmart right after. Weíre staying here tonight and try out some things in the am.

The picture is the ignition showing the bypass on the far left, red wire.

We checked all the fuses and theyíre all good except one that trips no matter how big a fuse we put in. There was one inline fuse on the ignition thatís good, not sure if thereís any more.



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Old 01-08-2018, 06:16 PM   #6
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with the ignition bypassed the ECM very well may not know the bus is turned on.. or may not have power to the proper relays... the ECM expects certain inputs to be high and then will trip the power and starter enable relays which allow the key switch to start it... you likely blew a fuse, or tripped an interlock of some sort..
-Christopher


Oh and for the interlock, we took out the back door one right away and it hasnít caused any problems, I did wonder if flipping some switches rattled the cage and woke some beast


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Old 01-08-2018, 06:24 PM   #7
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From that pic of the ign, looks like that connector has been heating up. That big red wire likely should have 12v to feed the switch. It is open enough at the bottom if you are able. Get rid of the bypass. Pull the wiring off the switch and clean the dust off, check connector condition on all wires. Are you able to check the switch out yourself for continuity? Just turning the key with no power and checking with a multimeter set on ohms. You might find the switch contacts are burnt also so best replacing it.
I think it's either the connector has a bad connection or the switch is kaput.

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Old 01-08-2018, 06:32 PM   #8
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roger - yes there is a dedicated solenoid.. but the ECM needs certain conditions to be met to enable the relay...

if the brakes arent releasing then when you left off the accelerator the bus should slow down real quickly and not just coast down. if the computer is Limped it wont allow the RPMS over 1500-2000 which wont shift the transmission at full throttle... is your WARN light lit at all when the bus is running?
-Christopher
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Old 01-08-2018, 06:40 PM   #9
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I doubt it is it? But can you hook the one in the back up again?
Next is where is the other wire on the push button hooked to? Any switch requires two points.
But if it's a bad switch then none of those other wires are going to get what they need as for as power. Unless they are all bypassed? Which with a wiring diagram could be done easily to get you home or just get another switch which Walmart don't sell and the repair shop just did something to get you on the way.
Born and raised in east Texas as an oilfield kid and know Louisiana. If you are around I-10 or 20 then hit a truck stop garage and they will get or have the parts you want.
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Old 01-08-2018, 06:58 PM   #10
Mini-Skoolie
 
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Quote:
Originally Posted by cadillackid View Post
roger - yes there is a dedicated solenoid.. but the ECM needs certain conditions to be met to enable the relay...

if the brakes arent releasing then when you left off the accelerator the bus should slow down real quickly and not just coast down. if the computer is Limped it wont allow the RPMS over 1500-2000 which wont shift the transmission at full throttle... is your WARN light lit at all when the bus is running?
-Christopher


Shoot! I totally forgot to mention the warn engine light turned on and has been on since the first morning when it wouldnít start!

Iím not sure where the push button is wired to, Iíll have to check in the morning.

The brakes feel ok, I donít feel like Iím slowing down too fast while coasting. The tow driver did have to manually release the brakes to move the bus but he took his tools out when he was done.

I donít know much about how an engine works, just so you know where Iím coming from. I would like to try and fix this myself tho. Gotta learn sometime


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