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Old 08-08-2021, 06:06 PM   #1
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Engine Alert, Ideas???

Currently on a trip and the alert came up on the dash. Checked all vitals and everything looked good so I made it to a near fuel stop. Fluid levels good, temps good, oil pressure good.
Restart and the trouble light had reset. Later it came on again.
The only sign of a problem is a 50-75 rpm fluctuation on the tach. All else feels normal! Only on tach, no surging from engine.

Any ideas???
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Old 08-08-2021, 07:11 PM   #2
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Get a code reader and look for any codes in the computer.

What chassis and drive train?
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Old 08-09-2021, 07:24 AM   #3
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When was the last time that the fuel filters were changed?


What engine do you have???? 350 ISC


If you have a surge tank, depending on the coolant level sensor, it might have an accumulation of stuff on it. My old surge tank had a coolant sensor that went down from the top into the coolant and was known to throw a low coolant alarm. Fix was to pull sensor, clean with a scotch brite pad and reinstall.
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Old 08-09-2021, 07:52 AM   #4
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Where are you? Just got back from a trip that started in Casa Grande, AZ (crazy hot) and ended in Mission, TX by way of Black Hills, SD. The coach weighs a little less than 30,000 lbs. and was towing a 2500 lb. Fiat. Between the ambient air temperature of around 100 degrees and pulling long uphill grades the Cat C-7 330 hp. engine would throw a check engine code. The temperature gauge would show we were getting hot. If you are driving under the same conditions with the same warning signs you may want to shut off your cruise control, shift the transmission down a gear to keep the RPMs up in the power band for your engine and keep an eye on your temp gauge. This has been a hot summer season and we donít all have 600 hp Diesel engines in our coaches. Sometimes you have to manually shift your Allison transmission to manage those uphill and downhill grades. If this doesnít apply to your situation feel free to disregard the entire post!
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Old 08-10-2021, 06:23 AM   #5
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It usually throws the code within a couple of minutes of at speed travel. I donít think it is temp related as the temp gauges have shown normal temp increases on climbs and it also happens on the flat areas near Chicago.

Does anyone have a suggestion of a code reader I could pick up at a local parts store?

I was thinking it could be a CPS starting to fail and that worries me.
Thanks
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Old 08-10-2021, 07:14 AM   #6
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Quote:
Originally Posted by jacwjames View Post
When was the last time that the fuel filters were changed?


What engine do you have???? 350 ISC


If you have a surge tank, depending on the coolant level sensor, it might have an accumulation of stuff on it. My old surge tank had a coolant sensor that went down from the top into the coolant and was known to throw a low coolant alarm. Fix was to pull sensor, clean with a scotch brite pad and reinstall.


Iíll check that out.
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Old 08-10-2021, 10:01 AM   #7
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It usually throws the code within a couple of minutes of at speed travel.
Are you saying youíre getting a CEL when you depart with a cold engine? This can happen if you have a wax valve conversion without using the restrictor. This can cause a CEL from high intake temperature.

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Old 08-10-2021, 10:06 AM   #8
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Are you saying youíre getting a CEL when you depart with a cold engine? This can happen if you have a wax valve conversion without using the restrictor. This can cause a CEL from high intake temperature.

Bill
This was my thought as well^^.


My coach would flash the dash light and store a code if the turbo was used too often or too long before the fan fully kicked in, and it was due to high intake temps. My coach has only the wax valve controller. This usually happened when I would first start out, get on the interstate and set the cruise control. Now, I use the accelerator pedal only until the engine is fully warmed. No issues since.
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Old 08-10-2021, 10:35 AM   #9
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It would happen with a fully warmed engine as well.
The reason I suspect the Crank position sensor is the 50 rpm fluctuation. Wonít know until I get a code reader.
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Old 08-10-2021, 10:35 AM   #10
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Get a code reader and look for any codes in the computer.

What chassis and drive train?

This first. Everything else is a wild guess.
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Old 08-10-2021, 06:02 PM   #11
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This was my thought as well^^.


My coach would flash the dash light and store a code if the turbo was used too often or too long before the fan fully kicked in, and it was due to high intake temps. My coach has only the wax valve controller. This usually happened when I would first start out, get on the interstate and set the cruise control. Now, I use the accelerator pedal only until the engine is fully warmed. No issues since.
Funny, I knew this was a problem. I would try to remember to use the block heater before leaving to warm up the coolant. And after getting under way I would be easy on the throttle. This summer I had to merge onto the freeway between two semiís (full power). Unfortunately I had forgotten to use the block heater. I first got a CEL and momentís later an engine shut down. Luckily I was able to coast to a turnout. As I remember, engine shut down is programmed around 170ís F intake temperature.
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Old 08-13-2021, 08:56 AM   #12
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So the winner appears to be the sensor in the coolant surge tank.
I had poor lighting when I checked the coolant level but could see it in the tank. Topped it off and the code light no longer shows up.
Thanks to everyone.
I still need a code reader. Any suggestions or just get a cheap one on Amazon?
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Old 08-13-2021, 12:26 PM   #13
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So the winner appears to be the sensor in the coolant surge tank.
I had poor lighting when I checked the coolant level but could see it in the tank. Topped it off and the code light no longer shows up.
Thanks to everyone.
I still need a code reader. Any suggestions or just get a cheap one on Amazon?
Great you found it and reported back.

I bought a FoxWell 301 from Amazon, but would recommend the 600 or 601 (donít remember for sure). The thing I like about the FoxWellís (at least these two) is they can store ďLive DataĒ to download to your computer.
Some on this board will recommend the ScanGaugeII. Youíll need to make sure it will work on your chassis - but frankly, I'm not impressed. The only thing it does that the FoxWell doesnít do is give transmission fluid temp - I can do that with a fluid temp sensor and set over temp alarms as well! - the ScanGaugeII doesnít have any alarms.

If you want to go the ScanGauge route, Iíll sell you mine. 😀
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Old 08-13-2021, 12:34 PM   #14
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I've got the Silverleaf VMSpc which monitors and provides real time data that I display on a laptop but it also does show codes and will save in history. I've had this for ~8 years but won't lie, I've had some problems with it communication to different laptops. I've just ordered a new Windows based tablet that will hopefully fix the issue.



I've heard good things about the Bluefire system but not sure if it will sense and display codes.
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