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Old 11-09-2014, 07:36 AM   #1
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Question Up hill power

We are traveling in our 2004 Coachman santara 37 ft class a motor home. All is fine on flat highway but as soon as we start up a grade the engine starts to "miss". I am thinking maybe a power pack or fuel filter? Workhorse 8 cyl Any thoughts?

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Old 11-09-2014, 07:55 AM   #2
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If not already done sounds like a full tuneup is do. 10 years with megga heat on plug wires and the plugs themself. Fuel filters and air cleaner, check timing and do a readout for anything that needs replacing.


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Old 11-09-2014, 08:01 AM   #3
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A "miss" suggests an ignition problem, so wires or maybe even a fouled spark plug could be it. Dirty fuel filters generally just cause sluggish performance under load - it just doesn't want to go. Probably time to change the fuel filter just on general principles, though.
Gary Brinck
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Old 11-09-2014, 11:46 AM   #4
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x3 on the ignition. Our friends had an '07 Coachmen on a Workhorse chassis. They had the same problem you describe and it was burned ignition wires. Replace yours with high quality silicone wires and maybe the plugs at the same time. The 8.1 generates a lot of heat and if there isn't adequate air flow, the plug wires and boots can burn.
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Previously '06 Itasca Sunrise 35A on a W22 Workhorse
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Old 11-09-2014, 12:10 PM   #5
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A lot of the Workhorse chassis with the 8.1 Chevy had an issue with providing enough airflow past the plug wires. They would get hot/burn and eventually fail. As mentioned, you probably need a tune up and look and see if you can add some ducting or sheet metal to increase airflow.

If you or a mechanic does the work, check the exhaust manifolds while in there. They were known for cracking, also caused by the heat.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
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Old 11-09-2014, 12:27 PM   #6
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Originally Posted by Dutch Star Don View Post
A lot of the Workhorse chassis with the 8.1 Chevy had an issue with providing enough airflow past the plug wires. They would get hot/burn and eventually fail. As mentioned, you probably need a tune up and look and see if you can add some ducting or sheet metal to increase airflow.
Our 2006 Winnebago Voyage has ducts in the front that push air directly to either side of the engine. The duct intakes are located down low under the grill.

Don Simmons
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