Thank you very much for the reply. I do not have excess oil as far as I can tell. And it is about time for an oil change anyway. Not sure what you mean by smoke, I guess when this tractor runs well I don't even notice exhaust. I guess what I am seeing is excess smoke.
I gave the injector test a shot just now. By loosening the fuel line, two injectors caused a major change in the idle, and basically two did not. With the two that did not, one may have been a slight change in the idle. But nothing like the two that did change the idle. For the two that changed the idle, there was almost no fuel leaking and the idle changed a lot. Just a small turn away from snug caused a major change in idle. For the two that I loosened that did not change the idle, there was fuel squirting pretty well.
How can two injectors go bad all of a sudden?
Thanks again for your help, and also everyone else that responded so far.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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