Cylinder 1 Pressure Variation High

Common symptoms

What you'll notice

• Check and replace the spark plugs in the cylinder 1.
• Inspect and clean the fuel injector in cylinder 1.
• Verify proper compression in cylinder 1 and perform necessary repairs if needed.
• Check the ignition coil in cylinder 1 for any malfunction and replace if necessary.
• Perform compression test on cylinder 1.

Common causes

Most likely first

1. Faulty spark plug in cylinder 1
2. Clogged or dirty fuel injector in cylinder 1
3. Low compression in cylinder 1
4. Ignition timing issue in cylinder 1
5. Faulty ignition coil in cylinder 1

How to diagnose & fix

Work through it in order

1. Engine misfires or runs rough
2. Reduced engine power or acceleration
3. Excessive fuel consumption
4. Difficulty starting the engine
5. Engine stalls or shuts off unexpectedly