What causes the fuel measurement system in cylinder 1 to run too rich?
2 Answers
Cylinder 1 fuel measurement system running too rich may be caused by the following reasons: Fuel mixture ratio: High engine fuel mixture ratio due to slight injector leakage, failed water temperature sensor, or potential malfunctions of the air flow meter and oxygen sensor. Cylinder pressure: Insufficient engine cylinder pressure with too small compression ratio. This can usually be detected by listening to engine performance, or by measuring cylinder pressure if necessary. Low cylinder pressure is typically caused by mechanical issues such as problems with pistons, rings, cylinders, or valves. Weak spark: Caused by spark plugs with carbon deposits, small gaps, poor performance, or issues like leakage and misfiring.
I happened to hear the mechanic talk about this last time I got my car fixed. If cylinder 1 has too much fuel injection, first check if the spark plug is flooded with gasoline – that thing won't ignite if it's soaked in fuel. Then the fuel injector might be stuck and not closing properly, dripping fuel like a faucet that's not tightened. If the oxygen sensor is covered with carbon deposits, it'll send wrong data, making the ECU pump in excessive fuel. Another sneaky issue is a faulty fuel pressure regulator in the tank – when oil pressure spikes, it directly floods the cylinder. If these problems aren't fixed, the exhaust pipe turns black as ink, fuel consumption skyrockets, and the car jerks when driving.
