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Deere 322 Help!

C

CRWD3020

New User
This is a long story so bear with me... I have a 1992 John Deere 322 with the 3 cylinder yanmar gas. It runs a little rough (misses every now and then) when I first start it up. As it runs longer and gets warmer it runs worse. Spits and sputters especially as I back off the throttle or slow the ground speed. I can't seem to nail down what's causing it. Here's what I have done so far... All new coils, new fuel pump, new plugs, cleaned carb and put on new gaskets, new fuel line from tank to pump, new fuel pickup in tank, and thoroughly cleaned tank. I also borrowed the transistor off of my dad's good running 322 to see if that was it and it didn't make a difference. This tractor only has about 550 hours on it. My dad and grandpa both bought theirs new and have never had this problem and both of theirs have ran very smoothly over the years. Any ideas/suggestions would be greatly appreciated!! Thanks in advance!
 
How about the fuel pump relay? Maybe a safety switch heating up. I have that motor in a F-932. The only trouble I have had with it is three burnt up fuel pumps,the pick up in the gas tanks and an bad fuel tank switch valve(two tanks no reserve) oh ya, the gas shut off solenoid doesn t like anything but straight gas. Every time I use ethanol the valve sticks shut and I have to take it out, wipe it off, and it will run for an hour or so till I have to do it again. Good luck.
 
There is a cut off needle in the carb and an electric coil that holds it open while running,if the coils gets weak it'll cause gas flow problems.I just took the needle out ground off about 1/2 inch of it
and put it back on and the engine ran fine after that.
 
That's rough! Thanks for the advice though!! I am thinking it has to do with the fuel shutoff solenoid. I will keep it clean and see what happens.
 
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