Serious? Not serious? Lend me your ears. 6v92 throttle and top speed

[gumpy]

The broken cable just went to a sensor. Best I can tell throttle position, I don't think my 82 mc9 has any Computer smarts on it.

Possibly part of a cruise control system. Hard to tell from the photo, but that part it goes into looks like an air cylinder like one I have that is part of a defunct cruise control.

[Oonrahnjay]

Time to change to air throttle. 

     My bus came with a hydraulic connector from pedal to fuel pump -- it was locked up with corrosion inside.  I put on an air-assembly, it worked very well.

[neoneddy]

My cruise also doesn't work, it's something I'd like to get working.   


Now in the original post I was concerned a bit about the smoke, I'm actually wondering if that was from the pedal never fully retracting and fuel being allowed to seep in while shutdown.  There is a fuel shutoff in the back, but I usually only use that when sitting for long periods of time.


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[bevans6]

The fuel rack that controls the injectors is controlled by the governor, not the pedal.  When the engine is turned off the governor goes to no-fuel and puts all the injectors in the no-fuel position.  When the engine is starting again, and being cranked, the injector positions are set by the starting aid, it positions the injector racks for starting.  As soon as the engine starts the governor takes over and controls the injector positions.  Smoke when starting is pretty much a function of cold cylinders not fully burning the injected fuel (the governor doesn't know the engine is cold) or burning off oil that might have seeped in from valves, bad rings, etc.

Brian

[neoneddy]

Thanks everyone.   I get such anxiety at times about stuff.

I have anew question, but I'm going to  start a new thread.

[MrCrowley]

Does smoke smell like diesel or burning oil you would know difference, check the oil in case your burning ( that is worse case) or could be cold start smoke all diesels will smoke a little when cold weather starting .


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[MrCrowley]

Time to change to air throttle.

Agree totally for safety more than anything else


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[neoneddy]

Agree totally for safety more than anything else


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Na, smells like diesel, earlier in the year when it was warmer she'd start up with no smoke.


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[neoneddy]

I want to resurrect this to post an update, nothing worse than an unresolved post.

I'm pretty sure the issue all along was my transmission being low on fluid.  After finding all my bolts loose on the bell housing recently, I'm pretty sure I was loosing plenty of fluid, so I never got lockup.  Makes sense in hind sight as I noticed when it happened on our trip back from the Dells  all of a sudden  I couldn't go  as fast as I was before and I was building some heat, nothing crazy scary, I just figured it was the hills and the heat.  MPG dropped after all of this too,  I think I posted this elsewhere, but I did end up adding almost 3 gallons, but I think I have the leak mostly fixed, and I'm carrying 3 gal of extra fluid and will be checking frequently.  Had Scott Crosby the mobile mechanic out  here  this spring and he gave the engine a clean bill of health, so nothing bad there, my worries there were just me being a newbie.

Now, my throttle linkage was still bent, but I'm guessing it was a poor man's governor that the old transit company did to keep black smoke down and MPG up.  I still don't get full WOT rack position, but I'm ok with that, no need to hammer it.

[luvrbus]

Did you see the leak ? loose bell housing bolts shouldn't make a 740 leak, you have to remove the the flywheel,lockup clutch and turbine and use a special puller to remove the stator and pump to get to the seal those don't free float like on a car