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Old 10-18-2014, 07:36 PM   #11
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Re: Extreme drop in horsepower

Do you hear the transmission shift all gears properly? Can you try manually shifting it and see if that makes a difference? I think you have eliminated it being the turbo.

I need you to tell me what engine it is...and if you know, what transmission. Front engine, rear engine??

The manual wont help with this.
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Old 10-18-2014, 07:38 PM   #12
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Re: Extreme drop in horsepower

After a filter check, you did check the AF right?

Could be shut off solenoid. From an online forum:
"Hey marine one : White lightning wins the money, I wired the solenoid up in the on position and it ran just fine, I also found out why they call it a fuel shut off. To my surprise when I shut the key off the truck just sat there running Ha Ha. I had to get out and loosen the wire then push the shutoff bracket to shut the engine down, then after startup had to push the solenoid up until it stuck and the truck ran fine. I have driven this truck for 3 yrs. now with this intermittent power problem and am very pleased from all the input and soon to be fixed problem. Thanks guys. dog 94

Read more: http://forums.dieselpowermag.com/70/811 ... z3GXi0baZT"
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Old 10-19-2014, 01:16 AM   #13
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Re: Extreme drop in horsepower

Quote:
Originally Posted by opus
Do you hear the transmission shift all gears properly? Can you try manually shifting it and see if that makes a difference? I think you have eliminated it being the turbo.

I need you to tell me what engine it is...and if you know, what transmission. Front engine, rear engine??

The manual wont help with this.
Greetings...I will pull the paperwork out of the bus tomorrow to confirm tranny and engine. I know it does have an Allison 4 speed automatic, and a friend of mine said he thinks the engine is a Cummins 8.3, or maybe an 8.9??? Oh yeah, and it is in the front.

I never noticed ANY problems with the shifting, no lag, no jumping, no whining....it just bogged down, and wouldn't get up a hill in my neighborhood. I barely made it home today. Strange...this is completely a new development with no prelude of symptoms that I could recognize.
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Old 10-19-2014, 01:23 AM   #14
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Re: Extreme drop in horsepower

Well if its bogging down, it may not be downshifting....which could be the throttle control module....or whatever the right name is for it. Thats why I asked you if you could manually shift it and replicate the same issue.

Its either a 5.9 or an 8.3
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Old 10-19-2014, 01:31 AM   #15
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Re: Extreme drop in horsepower

Quote:
Originally Posted by dond
After a filter check, you did check the AF right?

Could be shut off solenoid. From an online forum:
"Hey marine one : White lightning wins the money, I wired the solenoid up in the on position and it ran just fine, I also found out why they call it a fuel shut off. To my surprise when I shut the key off the truck just sat there running Ha Ha. I had to get out and loosen the wire then push the shutoff bracket to shut the engine down, then after startup had to push the solenoid up until it stuck and the truck ran fine. I have driven this truck for 3 yrs. now with this intermittent power problem and am very pleased from all the input and soon to be fixed problem. Thanks guys. dog 94

Read more: http://forums.dieselpowermag.com/70/811 ... z3GXi0baZT"
Greetings...By AF do you mean air filter? If so - no, I have not. In fact I have not yet check any of the filters yet - hell, I don't even know where most of them live yet. I am trying to determine the best starting place - besides the common stuff like all the gauges reading correctly, all the fluid levels being right, cranks up and runs immediately, shifts through all gears smoothly while sitting. Up until today it was like trying to hold back wild horses...this bus wants to ruuuun like Kunta Kinte!....LOL!

As I mentioned previously...I am new to buses - don't know much about this one. I bout it about two months ago, started the strip out for rebuild, then almost immediately found out I had to go through some chemo treatment, so all my fun got put on hold. I'm just now getting back to it.

I do appreciate any help or advice.

Thanks!
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Old 10-19-2014, 01:33 AM   #16
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Re: Extreme drop in horsepower

Quote:
Originally Posted by opus
Well if its bogging down, it may not be downshifting....which could be the throttle control module....or whatever the right name is for it. Thats why I asked you if you could manually shift it and replicate the same issue.

Its either a 5.9 or an 8.3
Yes...even if I manually shift down I get the same result. Like I mentioned, there was no precursor to a problem...just happened.
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Old 10-19-2014, 01:38 AM   #17
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Re: Extreme drop in horsepower

Oh yeah - forgot to mention: When I turn the key off to shut down the bus engine keeps running. I have to lift the cowling cover inside, reach into the engine compartment to manually pull a switch on the drivers side of the engine to shut it down.
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Old 10-19-2014, 01:48 PM   #18
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Re: Extreme drop in horsepower

Quote:
Originally Posted by opus
Well if its bogging down, it may not be downshifting....which could be the throttle control module....or whatever the right name is for it. Thats why I asked you if you could manually shift it and replicate the same issue.

Its either a 5.9 or an 8.3

OK...Just confirmed: It's got a 8.3L L6 Cummins, and an Allison 4spd Automatic trans.
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Old 10-19-2014, 01:53 PM   #19
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Re: Extreme drop in horsepower

I am going to have to rent a steam cleaner for a day to clean the entire drive train area. It's got 2 1/2 decades of crap down there. Any recommendations from anyone before I do it?....anything to be very cautious to NOT steam. I don't wish to compound this current problem. I appreciate the advice....Mark
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Old 10-21-2014, 10:13 AM   #20
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Re: Extreme drop in horsepower

I would check and make sure the brakes aren't dragging first, because it is extremely simple to do so. Then I would check for any fuel issues.

I wouldn't completely rule out the transmission, but if you dropped it in manual 1st and it still wouldn't accelerate, I doubt the transmission is at fault.

Start with the filters, check the fuel to make sure it hasn't turned bad. Then you start troubleshooting.

Seeing how it is an 89, it would be mechanical injection.
I would check that the shutoff lever operates and releases correctly, then I would check to see lift pump pressure is adaquate.

After that I would check if it has a smoke limiter on the injection pump. What they do is limit rack travel in the pump with a diaphragm until it receives boost pressure from the manifold. If that checks ok then I would check the turbo wastegate that it isn't frozen and works correctly.
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