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Old 04-18-2016, 08:37 AM   #1
Mini-Skoolie
 
Join Date: Jan 2015
Location: Akron, Ohio
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Year: 2001
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Check Engine Light Problem

I believe I have a 2001 Thomas Saf-T-Liner MVP ER (EF?)



I have been working on my conversion for a year and am finally titled and insured. I took it to a mechanic to get an oil change, fuel filter change, and general inspection to see if it's ready to take on a trip.

When I started it, the check engine light came on. I was 6 miles from my mechanic so I let it idle for 10 minutes and then hit the road. I had a lot of distractions as it was my first time driving the bus, but it seems like the engine was limited. I couldn't get past 35 and about 1900RPMs. A mile out from the mechanics, the light switched off and the bus had more power and hit 45.

The mechanic gave it a clean bill of health, said he gave it a test drive and it was great, and he hadn't seen any limit or check engine light.

So later I was driving it away from the mechanics after hours and it did the same thing but the check engine light never went off and the RPMs never went above 1900-2000.

What is going on? Am I destroying my bus?

I just found the manual so hopefully I can get a fault code soon.
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Old 04-18-2016, 10:17 AM   #2
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Location: Arizona via Baton Rouge
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Year: 1999
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Chassis: Freight-shaker (Freightliner)
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The MVP has 2 models. The ER (Engine in Rear) and the EF (Engine in the front).

I have an ER, when I start mine I have to let the motor come up to temp (about 190-195) for optimal power. If the motor is too cold, it will not "get up and go". My check engine light stays on until it is warm enough to run. I was told by my mechanic and my dad both that this was normal for these older motors.

If your light is on and won't idle high, I'd take it back to the mechanic and let him/her diagnose it, unless you think they caused it. Then find another one to go to.


If they changed fluids....... check the levels, could be that one of them is too low??
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Old 04-18-2016, 10:50 AM   #3
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If the light is on, a code should be stored. Have him read the codes and figure it out. It could be something as simple as a throttle sensor. But without codes it's anybody's guess.
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Old 04-18-2016, 10:53 AM   #4
Mini-Skoolie
 
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Well, that answers another mystery! Good to know I have an EF.

When you say it won't "get up and go," do you think it is actually limited? If not, does it hurt the engine or the transmission to drive it when it doesn't want to go faster than 35?
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Old 04-18-2016, 10:59 AM   #5
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Join Date: Feb 2014
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I honestly don't know that answer, I usually wait until it is at normal operating temp before I drive mine. I do move it back and forth in the driveway as soon as I hear the drier hiss on the air system so i know I can get it to move....
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Old 04-18-2016, 11:04 AM   #6
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Join Date: May 2014
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Engine: 6.9 International
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Barbarossa, yours will actually be limited. They call it engine derating in which it will cut off most power and rpm's will be limited to less then 2000. A whole host of engine codes will cause that. You can also cause that by having mismatched options entered into the computer.
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Old 04-18-2016, 11:19 AM   #7
Mini-Skoolie
 
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Thanks for the info. Sounds like I'm stuck until I can read the codes.
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Old 04-18-2016, 07:33 PM   #8
Mini-Skoolie
 
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I managed to use the engine diagnostic button to get the "stop engine" light to flash the error codes. It is flashing 235 235 115 115 and then repeating. According to this manual, 115 is the "oil change interval condition" which I can probably override somehow as I had the oil changed last Friday. Any ideas what the 235 code is?
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Old 04-18-2016, 07:37 PM   #9
Mini-Skoolie
 
Join Date: Jan 2015
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Wait, is 235 the coolant level? I might have dodged a bullet.
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Old 04-18-2016, 07:48 PM   #10
Mini-Skoolie
 
Join Date: Jan 2015
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Engine: Cummins 5.9
Rated Cap: 72
Ok, now I can't make as much sense of it as I thought. Apparently 115 can also mean "Engine Magnetic Speed/Position Lost Both of Two Signals - Data erratic, intermittent or incorrect"
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