The computer reads the speed through the speedometer. If it is not getting the correct speed, the computer is adjusting the fuel rate for the speed the sppedometer is saying,not what the truck is actually doing. In your case the speedo is reading about 25% fast,so it is adjusting the fuel rate to maintain 80 KPH when it is actually running 60 KPH. It is a closed loop system so everything has to be correct to obtain maximum mileage,while still retaining driveability. So the engine has to be at proper operating temperature, the truck has to be moving at the speed the speedometer is reading,etc.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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