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Stop engine light.
The check engine and stop engine lights came on Friday. I started and ran the bus for a while Thursday with no problems, the upon starting Friday the warning lights came on. The oil pressure is good, engine was cold, so, no hight temp, and coolant level is ok, I did jumper across the coolant sensor just in case, no change.
Any ideas where to check next? Thanks.
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12 Replies
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Any time a stop engine light comes on there are only going to be three potential issues.
Low coolant which you have addressed, low oil pressure, or high engine temp. I would suggest as soon as possible see if you can pull up the code. Reading a code is possible with a reader, but I think on all coaches it can be done without a reader. I am not sure of the way to bring them up on your vintage. Perhaps a member or Prevost can offer some help.
If the gauges for the temps and pressures were OK my guess is a sensor is going bad. Sometimes a faulty code is a problem relating to a bad ground, so the next step is to read the code so you isolate the area for checking the problem.
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I don’t remember the process, but on the XL’s you use the check engine light to show the codes. It’s easy to do and is covered in the Prevost manual or maybe someone here can recall how to do it.
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I experienced the same problem, I had a DD repair shop pull the codes. They found 275 over-temp codes, they changed the coolant temp sensor and no problems since then. Looking on DD forums that is a common problem, it is either the sensor or the multi pin plug that connects to the sensor. This could possibly be what you are experiencing. Good luck
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Even though there appeared to coolant showing in the window of the overflow tank, adding a little coolant cured the problem.
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Your sight glass needs to be cleaned, be careful not to break the glass. Unscrew it and clean it My sight glass got like that and I broke it, about $150 from Prevost
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This is going to sound stupid, but while the sight glass is one indicator of coolant level, I prefer to know whether the coolant level is just above the sight glass or much higher. So I have a small wooden stick in my garage I keep near the rear of the coach. Before a trip I stick the coolant tank and know just how much coolant is in there.
Can’t beat that for accuracy.
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I check my level cold at about midway on the sight glass. Seems to be fine.
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Not stupid Jon, I roll up a paper tower to check level when I have nothing else to do it with.
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I just stick my finger in
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If you can reach the coolant level with your finger, I’m surprised you don’t lose some out the overflow with a hot engine. The coolant level will change significantly during operation and even changes on my coach with significant differences in ambient temps.
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my glass should probably be replaced its pretty cloudy. Actually I usually step up and look down in as well. My reservoir has a plate just below the opening
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my glass should probably be replaced its pretty cloudy. Actually I usually step up and look down in as well. My reservoir has a plate just below the opening
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