| Matron Voyage [message #224770] |
Mon, 07 October 2013 10:09  |
xplorid
Messages: 213
Registered: February 2012
Location: Boise
Karma:
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Senior Member |
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My coach is no virgin, so I can't call it a maiden voyage - but, this past weekend took my wife, the two dogs and me to the Oregon coast and back, our first real travel and living in it. It was great, everything worked, and those of you in Coos Bay know the weather was pretty spectacular. I did have some surging idle weirdness when the engine warmed that needs some follow-up.
BUT, on the way back, after running perfectly for hours even going up that long grade east out of Pendleton, I had vapor lock issues and had the fan clutch cycling with the engine coolant temp at 185. It was not more than 70 degrees out, the tanks were 75 degrees when I shot them with the IR.
If the gas was vaporizing, it was doing close to the carb with ambient heat, I guess. So hot intake manifold + un-baffled grill to radiator (poor air flow)? Any other speculation is welcome, but time to pull the intake, check for cracks, and reassemble with block-off plates and get the baffle kit from Jim K?
Looking thru PO docs, previous problems of running hot, carb rebuild and carb replacement. I have an Al radiator, hot weather driving runs at 185 this past summer and never above 200.
Jeff
1974/94 GMCII by Explorer
Manny 6.5 TD Al radiator
1 ton front 4 bags back
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