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Get on the highway up to operating temperature. Accelerate steadily while watching your exhaust. See some black smoke while accelerating? Let it slow and accelerate it. No need to punch it, just a firm steady acceleration that keeps the engine rpms rising without hesitation.
Now why are you building carbon? Running rich? Burning oil? A too cold thermostat? If you are lugging around in a too low gear too much that can build carbon. Plugs in good shape properly gapped? Good hot spark?
Get on the highway up to operating temperature. Accelerate steadily while watching your exhaust. See some black smoke while accelerating? Let it slow and accelerate it. No need to punch it, just a firm steady acceleration that keeps the engine rpms rising without hesitation.
Now why are you building carbon? Running rich? Burning oil? A too cold thermostat? If you are lugging around in a too low gear too much that can build carbon. Plugs in good shape properly gap i Good hot spark?
it doesn't use oil, not sure about the thermostat, I'll check the plugs. As far as it lugging it's an automatic
When you remove the plugs, replace them with copper spark plugs, These trucks seem not to like those new expensive spark plugs. Get them from a local trusted place, not off the web.
How old are the plug wires. I put a good set on some 25 years ago.
FWIW, my 86 has this label. If I'm just driving slow I'll leave it in, the D not the OD.
I have an update. What I talked about before was from memories from 7 years ago. Well in the last couple of days I started getting it ready to run. While doing that it came back to me that once it got warm and you went to shut it off it would diesel terribly. That's what it's doing now, it will diesel for 15 to 20 seconds then it would make a noise which sounds like it's coming out of the carb almost like a backfire thru the carb, but not quite. I've ordered some stuff that's supposed to remove carbon.
Is there anything else I should try? Tia
There are a few reasons why this may happen and if you did the water down the carb when the motor was up to temp I would say no carbon that could stay hot.
Wrong spark plugs and or heat range staying hot.
But most of dieseling is the idle RPM is too high, set it to the factory spec or a hair lower and see what happens.
Mine only diesels when the idle RPM is too high.
Dave ----
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