Will low compression cause a lean condition?
Low compression generally shouldn’t be the cause of the persistent lean condition you are seeing, unless you have a burned exhaust valve. The wet test on compression pretty much confirmed that the rings are likely the culprit of weak compression.
Can a bad valve cause a lean condition?
Again, if one cylinder intake valve fails to seal, how would that affect the fuel trims? Just like a problem with an exhaust valve, an intake valve usually starts as an intermittent problem that may not be noticeable or set codes. But this time the O2 sensor would see a lean condition.
Can an exhaust leak cause a misfire?
Lean exhaust code and misfire codes set on the bank with the exhaust leak present. The exhaust leak did not cause an immediate misfire. Besides, can an exhaust leak cause loss of power?
What causes a p0171 Bank 1 lean condition?
Most likely possible causes for this P0171 bank one lean condition per manufacture. Ford, Lincoln and Mercury cars and trucks: Air or vacuum leak, Oxygen Sensor or Mass Air Flow Sensor.
What causes an engine to run too rich or lean?
The engine tries to compensate for this cylinder not firing and can cause the engine to run rich, or lean. Common causes of a misfire are spark plugs, wires, coil, fuel pump, fuel injector, vacuum leak, cap and rotor.
Can a bad ECU cause all cylinders to misfire?
A faulty Engine Control Unit (ECU) can cause multiple random misfire codes. A bad ECU will most likely cause misfire codes on all cylinders, but it may affect only specific cylinders in a few rare cases.
What causes bank 1 lean condition with Random Misfire?
A cold rough idle that diminishes as the engine warms up. Possible DTCS P0171, P0174, or P0300. Random misfires at idle. The intake gasket seals may be leaking around the intake ports, causing a lean condition. The intake gasket seals may leak around the bottom side of the port, making it a challenge to detect the vacuum leak.
Lean exhaust code and misfire codes set on the bank with the exhaust leak present. The exhaust leak did not cause an immediate misfire. Besides, can an exhaust leak cause loss of power?
Why do I misfire all cylinders on one side of engine?
Because the exhaust can not escape the cylinder, it builds excessive pressure, and that cylinder will not fire properly. Each catalytic converter is connected to all the cylinders on one side; you will end up getting several misfire codes plus the typical P0300 random misfire code.
A faulty Engine Control Unit (ECU) can cause multiple random misfire codes. A bad ECU will most likely cause misfire codes on all cylinders, but it may affect only specific cylinders in a few rare cases.