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Farmall & IHC Tractors Discussion Board |
Re: 400 missing
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Posted by Janicholson on May 01, 2007 at 18:15:23 from (66.173.50.137):
In Reply to: 400 missing posted by LeeCramsey on May 01, 2007 at 17:54:43:
The farmall engine (A B C H M W4 W6 X00, and X50 as well as others) are running carburetors that are stone age technology. They feed in enough fuel to operate, but are no way scientific about it. They work best under load, where the engine is fundamentally pumping volumes through the combustion chamber. Unburned fuel from combustion chamber quench at idle, combined with straight through exhaust, and richer than nominal mixture causes micro back firing in the exhaust pipe with no cylinder miss at all. this causes the popping sound, the rain cap to dance, and (at night down a hill,) quit a visual display. It is not fixable, it is not broken. A real miss will be consistant, on one cylinder, not bad timing, or distributor bushings, and usually happens at various speeds. An intake leak can also cause idle miss, but again it will be consistant. If a tach placed on the ignition shows no dip in RPM, you are looking at the nature of the beast. JimN
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