| Re: [GMCnet] Hello from Colorado again.... [message #318117 is a reply to message #318114] |
Sun, 28 May 2017 23:37   |
Bullitthead
Messages: 1411
Registered: November 2013
Karma:
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Senior Member |
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If the timing changed while cruising down the road and the distributor was not loose and is not the problem area as others have described, the only procedure to set the ignition timing is going to be by feel and hearing because the chain has slipped a tooth. Or the distributor gear was made from the wrong material and wore out and slipped (unlikely but possible). Take a picture of the distibutor position on the engine (top down) and then loosen it enough to turn it by hand but still a little stiff. Start the engine and carefully move it to advance the timing and see if engine runs smoother. Advancing is turning the body the opposite direction of shaft rotation. If it smooths and your power comes back (some), you might get it the rest of the way home where you can do the static timing check to check the chain.
More likely would be the filter sock in the tank getting full of sediment from the long drive from Va. When you run out of power, will the engine still respond a little to a quick jab on the accelerator? By the time you get stopped the pump may have had enough time to fill the carb, even when the fuel path is mostly blocked and will not allow enough flow when you need power. Then the carb drains down...but there may still be a partial shot in the accelerator pump, so check for that tiny little boost.
Another possibility is the old fuel filter split, ripped, rotted in a spot due to water, or for any reason whatsoever let some dirt pass and now its in the small filter on the carb, or if it was THAT filter that gave up, and the stuff is now in the carb, partially blocking the fuel flow to the metering jets. Probably would have a decent idle with that scenario unless it is a large quantity of contaminants.
Changing a fuel filter as preventive maintenance put me on the side back in high school after a tiny piece of the fuel hose made it through the needle and seat and found its way to the main metering jet in the Falcon six-cylinder.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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