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Farmall & IHC Tractors Discussion Forum
:

IH 464 gas, rough runner at low RPM

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Jay Kinder

12-17-2004 17:30:31




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I have a 1974 IH 464 gas that runs rough at Idle and low RPM.It runs fine under a load and at higher RPMs.I have installed new plugs,wires,distributor cap and rotor. I have also cleaned the carb and installed a new air filter. I did not put any new parts in the carb.I was told that it could be a burned valve but I want to make sure it is not a carb. issue before going any further. Any suggestions, Thanks in advance.

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Allan in NE

12-17-2004 18:02:36




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 Re: IH 464 gas, rough runner at low RPM in reply to Jay Kinder, 12-17-2004 17:30:31  
Jay,

If you are absolutely sure it is A-Okay at off idle and under pull (these things can sometimes fool ya), here's some ideas.

I'd really check for a vacuum leak at the intake manifold or carb base area. Also, are you sure your idle circuit in the carburetor is okay and functioning?

Also, a high dwell setting could cause your headache.

A burnt valve won't cause a discriminate idle miss; a burnt valve will make it miss all the time. However, a valve guide that is wobbled out can & will cause this symptom and could make it miss only at idle.

Hope ya get 'er,

Allan

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