Grinding Noise From Engine on Acura Integra

The 1990-2001 Acura Integra, all models, has a known issue with ignition distributor shaft bearing failure, which causes:

• Failure to start
• Engine randomly misfires
• Check Engine Light Illumination
• OBD Trouble code(s) P0300, P0301, P0302, P0303, P0304, P1336, P1337
• Engine vibrations
• Hesitation or stalling
• Oil leak from distributor cap

The ignition system uses the distributor to send high voltage electricity to the spark plugs at the right time. It accomplishes this timing mechanically by a shaft, which connects the crankshaft and ignition distributor, so they spin at the same rate. That shaft, part of the distributor, rests in a bearing inside the distributor.This bearing, the distributor shaft bearing, is known for failing, and allowing the shaft to move slightly.

As the bearing fails, it allows the shaft to move away from the shaft seal, and oil pours into the distributor cap, causing misfires.

The play in the shaft can also cause contact with the crankshaft position sensor, causing a no start problem.

Total bearing failure will be most evident from the grinding noise that changes with engine speed, and oil in the ignition distributor cap.

If the bearing is making noise, driving or running the vehicle can result in catastrophic engine failure.

To correct this issue, the ignition distributor and shaft must be replaced. Any damage to the crankshaft position sensor will necessitate replacement as well.