| Engine Surge Under Load [message #322193] |
Wed, 16 August 2017 09:49  |
David del Rio
Messages: 49
Registered: April 2016
Location: Raymond CA
Karma: 0
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For a number of reasons my coach has sat for nearly a year, being run periodically to exercise the engine. I realize there is much more I should have done to better prepare the coach to sit for a long while such as fuel treatment, etc. Now the coach is getting back into action and upon starting yesterday I let the coach idle for a good while. Then, when underway for a brief while found that the engine was surging while under load.. under way. Stopped, at idle, the engine just purrs without surge. What has likely happened? And what are the most efficient steps I can take to resolve the issue. Thank you in advance for your input. Dave
David del Rio - 75 Avion - Raymond, CA
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| Re: Engine Surge Under Load [message #322194 is a reply to message #322193] |
Wed, 16 August 2017 10:25  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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The first things that come to mind are:
1. Dirty gas filter(S)
2. Winter blend gasoline
There are lot of other things it could possibly be.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Engine Surge Under Load [message #322196 is a reply to message #322193] |
Wed, 16 August 2017 10:58 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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David del Rio wrote on Wed, 16 August 2017 10:49For a number of reasons my coach has sat for nearly a year, being run periodically to exercise the engine. I realize there is much more I should have done to better prepare the coach to sit for a long while such as fuel treatment, etc. Now the coach is getting back into action and upon starting yesterday I let the coach idle for a good while. Then, when underway for a brief while found that the engine was surging while under load.. under way. Stopped, at idle, the engine just purrs without surge. What has likely happened? And what are the most efficient steps I can take to resolve the issue. Thank you in advance for your input. Dave
David,
I am glad that you are getting back to your coach.
You should know that there is nothing good that happens when an engine is run at idle.
When you write "exercise", did it move? If not, that could be part of your problem.
As Ken and Jim both wrote, there are things you should check out first.
You wrote "Surging under load", was this at a constant throttle position? Or was the power not regular with the throttle position?
If it is the former, then there is a good chance that it is fuel condition or minor carburetor fouling. Run the current fuel down and load new and some fuel system cleaner. That may be enough.
If it is the later, then there is a better chance that the carburetor will have to be disassembled and cleaned.
If you idled the engine excessively, it may have carbon accumulated in the cylinders. The easiest cure for this is to take her out and run her a good ways as highways speeds. And, that is a good way to get the new fuel into the system too.
Did you notice that a lot of what ails her may be that she was not run? This is common and more so with older engines.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: Engine Surge Under Load [message #322198 is a reply to message #322193] |
Wed, 16 August 2017 11:53 |
David del Rio
Messages: 49
Registered: April 2016
Location: Raymond CA
Karma: 0
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Gent's... Thank you one and all!
- Ken.. Yes, it's time to change the fuel filter(s) no matter what.
- James.. you might be spot on!!! We found mouse droppings under the hood where there were none before! I'm going to check the vacuum lines first!
- Matt.. I come from a boating background and have learned the hard way what happens when an RV or boat sits. The same thing happened to my 'engine' over the winter. Following a failed back surgery I (and the coach) spent the past year not being moved... and I too am showing signs of failure by neglect. Fortunately I'm somewhat back on track, and so have turned my attention to my beloved coach! She was only just moved a few hundred feet and the surging was while slowly under way with a constant throttle pressure, while going up hill. Idle was smooth and at normal rpm's. I'm going to do the items above, then load her up with fresh fuel and a cleaning/conditioning additive followed by exercising her on the road. Fingers crossed for a simple fix!
David del Rio - 75 Avion - Raymond, CA
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