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Update on 350 runs but misses
:

still need help!

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Gill

08-16-1999 18:45:33




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Okay, so far I have changed plugs, wires, distributor cap, rotor, points, condensor and coil. Adjusted carb to run leaner, checked governor springs in distributor. Still misses just like when I started working on it. It must be something either stuck or broken, because problem started all of a sudden. Compression checks 140 psi on all four cylinders. Could problem be stuck exhaust valve? Thanks for your earlier suggestions.

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Pappy

08-17-1999 16:48:33




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 Re: Update on 350 runs but misses - still need help! in reply to Gill, 08-16-1999 18:45:33  
If you have 140 PSI on each cylinder, forget about bad valves. I had an H last week that would run perfectly for the first ten seconds after it was started, then start to miss on # 3 cylinder. After it warmed up, I sprayed carburetor cleaner under the intake manifold around the #3 and #4 port and it started running perfectly. Sealed the leak and readjusted the carburetor and it runs like was made last month.

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C. Amick

08-17-1999 09:46:39




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 Re: Update on 350 runs but misses - still need help! in reply to Gill, 08-16-1999 18:45:33  

If the tractor has been sitting for a while, a valve could have been stuck causing you to bend a push rod when you started the tractor. Intake valves seem to be worse to stick than exhaust.



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Z-BAR

08-17-1999 03:46:08




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 Re: Update on 350 runs but misses - still need help! in reply to Gill, 08-16-1999 18:45:33  
I agree in part with what Richard said about a vacum leak. with the enging running, spray some 556, wd40 or either, where the manifold mates the head and see if the engine speeds up. If it does you have found the problem. hope this helps.



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Richard

08-16-1999 20:35:39




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 Re: Update on 350 runs but misses - still need help! in reply to Gill, 08-16-1999 18:45:33  
Check for vaccum leaks on the connection at the carb to the manifold and the manifold to the head. you can use motor oil in a pump oil can. also check your valve clearances.Does this tractor use oil? Also look at your plugs and see if they are wet or dry might give you a clew. If the tractor is smoking see what color the smoke is black is rich condition ,blue oil and if black I have found most of the time it is the ingition not the carb as you would think. also the bearings get bad in those dist and they won't run wright then.

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ltf in nc

08-16-1999 20:17:45




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 Re: Update on 350 runs but misses - still need help! in reply to Gill, 08-16-1999 18:45:33  
Remote chance but not out of the question, it could have a broken intake valve spring. If the exhaust valve was sticking the compression would be off. I tend to think it is a electrical problem such as a cracked dist. cap, plug, or a bad plug wire. Look at all the plugs again and see if you can locate one that is different in appearance than the rest. It will be a fault with that cylinder.



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