| Author |
Message |
shawn shannon (192.112.251.48)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 15, 2004 - 3:26 pm: | |
I have been having a problem with my 6v92 in my 83 Eagle. When I start the bus, I can go at normal speed/power for about 10 miles. Then the pedal will fill hard, and the bus will slow down to 45 miles. If I pull off and let the engine cool down for 5-10 minutes, I can make another run at 65 miles for about 5 miles.
I noticed that when it gets colder out side, the bus will speed up. The engine temperature is normal. The bus started doing this last year when the fast idle quit working. It does not stop the RPM, the engine will race to highest RPM.
Based on suggestions, I have changed the turbo, air filter, oil, and gas filter. I plan on taking it to Freightliners next week, but does anyone know of something else that I might have missed?
Thanks |
John the newguy (199.232.240.38)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 15, 2004 - 4:14 pm: | |
How about a loose connection in the fast idle circuit in that panel next the
driver's seat (accessable from the outside) that's known for heavy rust
and corrosion?
Cold circuits contract; application of power heats and expands. Having
the fast idle kick in while driving will result in a lack of control for acceleration. |
Stan (68.150.152.113)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 15, 2004 - 4:49 pm: | |
Is your statement correct in that the bus slows down but the engine will go to max RPM? |
bowlingshoegiverouter (63.185.97.46)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 15, 2004 - 4:53 pm: | |
wow newguy...good thinkin' |
JImmci9 (209.240.205.68)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 15, 2004 - 5:16 pm: | |
if you have an air shut-down cylinder on top of the governor housing, disconnect it.. then try... sounds like it might be getting aired-up... also might try trouble-shooting the high-temp/low oil pressure shut down circuit... may be giving a signal (thats in error) to shut the engine down... verify that you are really not overheating and that you have good oil pressure before you dis-able the shut-down circuit.... |
Tim (209.205.134.168)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 15, 2004 - 7:12 pm: | |
Just thinking out loud...if engine gets enough fuel gov. must spin enough to set the racks at full rpm.
Fuel pumps are inexpensive and you did not say it was changed.
Since it started with the fast idle circuit you might want to pull the fast idle solenoid assy., check for broken or missing parts against a new one, then install the new one.
You might think of how the heat would cause the system to suck air.
Make sure throttle arm is not slipping on shaft coming out of gov. body.
Under no circumstance apply brake fluid to anything.
Thanks for the post. It helps us all learn if we are willing. |
Henry R. Bergman, Jr. (Henryofcj) (63.224.197.10)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 15, 2004 - 7:27 pm: | |
Let's think weird for a moment. Could it be fuel starvation caused by clogged or impacted fuel lines?
Are your lines steel or rubber? Rubber over times reacts with the diesel fuel and they swell up...
...on the insides liked clogged human heart arteries. They can look like new on the outside, but...
...be clogged up on the inside. Enough fuel is passed to start and run the mill, but not enough to...
...allow full power. The fuel temp also can affect the clogging problem. Try replacing ALL the...
...rubber fuel lines if you got 'em and see if it makes a difference. Might just be time to change them...
...out anyway and it does not take that much time or $money$. Now you will tell me you have all steel...
...lines. Aaaauuuuuggghhhhh! Oh, well, I was just trying to help. Do you have a fuel pressure gage? Good luck. |
Luke Bonagura (Lukeatuscoach) (209.247.222.114)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 15, 2004 - 8:50 pm: | |
Hi Shawn:
I am only jumping in on this conversation because you have already thrown enough money at this problem and it still exists!!!
I am reading what you wrote and one thing confuses me????
"THE BUS STARTED DOING THIS LAST YEAR WHEN THE FAST ISDLE QUIT WORKING. IT DOES NOT STOP THE RPM, THE ENGINE WILL RACE TO THE HIGHEST RPM".
You further state that the accelerator pedal feels HARD!!!!!
It is not easy, by this medium to diagnose all problems, but I would suggest that your "Fast Idle System" is on!!! and when you step on the accelerator that you are fighting the fast idle system.
I don't not know what your mechanical ability is, but on top of the engine governor are two Shrader valves. One is the engine "on and shut down" and the other is the "fast idle cylinder". They are attached to the governor top by 2 bolts or screws.
Loosen the 2 screws on the fast idle cylinder(Shrader Valve) and remove one of them. Move the cylinder to the side so that it is not functioning. Take the coach for a ride and see if you still feel resistance on the accelerator and see if you get full speed out of the coach.
If so, the problem could be in the Shrader Valve or the Skinner valve that controls the fast idle.
I Hope this HELPS, and if need be, give me a call.
Happy & SAFE Bussin' to ALL!!!
LUKE at US COACH |
Jack Perry (Jpwinks) (66.174.6.204)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 15, 2004 - 11:25 pm: | |
Based on the limited syptoms posted I will agree with Luke 100% on this. I am interested in hearing the final diagnosis. |
cgoodwin (208.12.29.127)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, June 15, 2004 - 11:55 pm: | |
Ask Don Fairchild at Clean Cam Technologies systems http://www.cctskit.com/main.htm he is the most knowlegable and one of the nicest diesel mechanics I have spoken with. Willing to talk with complete novices and a great source of advice. He has spent a considerable amount of time researching my engine problems and giving me free advice on performance upgrades and modifications... Really a nice guy...met him here!
chris |
Catskinner! (63.188.232.27)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, June 16, 2004 - 8:29 am: | |
It seems that if RPMs. are still up, that
transmission or clutch might be slipping,
whichever migh be the case. Just a thought.
Good Luck!
Catskinner!
Sonnie Gray
0/5 Eagle 3406 Cat
Pottsboro, Tx |
BrianMCI96A3 (208.13.135.165)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, June 16, 2004 - 8:32 am: | |
Yup, I'm with Luke, the pedal gets hard comment did it for me.
Brian |
John that newguy (199.232.240.242)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, June 16, 2004 - 10:20 am: | |
Catskinner... Those words about RPM were overlooked. I didn't
understand what he meant, so I disregarded it too.
If the rpm can be max'd and the vehicle will not go faster than 45mph
(third?) it would make more sense to look at the automatic transmission.
He claimed the pedal seems to feel stiff at that time. I can imagine that if
I were driving a vehicle and the engine started racing but the vehicle was
going slower, I might start stepping on the accelerator harder to compensate. |
BrianMCI96A3 (65.160.215.59)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, June 16, 2004 - 11:05 pm: | |
I suppose that a tranny problem is a possibility, but I assumed when Shawn mentioned that the engine would race to it's highest RPM, he meant while the tranny was in neutral.
Brian |
Buswarrior (Buswarrior) (64.229.212.13)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, June 17, 2004 - 10:40 pm: | |
Shawn, I'm with Luke.
Do not spend a moment longer on anything else until you positively rule out the fast idle and related mechanisms aren't obstructing the throttle.
Full RPM does not automatically mean full fuel travel is available to all the parts that make up the throttle, governor, rack and injectors. For instance, you can get full RPM with very little advance in the fuel delivery system in neutral, and you might be surprised how often when driving the injectors are NOT at full fuel.
My money is on something either obstructing or broken off, preventing proper functioning of the fuel controls.
Be sure to let us all know what you find!
happy coaching!
buswarrior |