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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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