Cylinder 3 Pressure Variation High

Common symptoms

What you'll notice

• Perform a compression test on cylinder 3 to check for any abnormalities or loss of compression.
• Check the ignition system, including the spark plug, ignition coil, and wiring, for any faults or malfunctions specific to cylinder 3.
• Inspect the fuel injector of cylinder 3 for any clogs or improper operation that may be causing high pressure variation.
• Verify the engine's timing and make any necessary adjustments if it is found to be out of sync.
• If none of the previous steps resolve the issue, it may be necessary to inspect and potentially replace the cylinder head or related components.

Common causes

Most likely first

1. Faulty ignition coil or spark plug
2. Clogged or dirty fuel injector
3. Low fuel pressure in cylinder 3
4. Engine compression issues in cylinder 3
5. Faulty engine control module (ECM) or sensor related to cylinder 3

How to diagnose & fix

Work through it in order

1. Decreased engine power or performance
2. Rough idle or engine misfire
3. Engine hesitation or stumbling during acceleration
4. Excessive fuel consumption
5. Check Engine Light (CEL) or Malfunction Indicator Lamp (MIL) illuminated