Cylinder 8 Pressure Variation High

Common symptoms

What you'll notice

• Check and replace faulty spark plugs in cylinder 8.
• Inspect and replace damaged ignition coil in cylinder 8.
• Clean or replace clogged fuel injectors in cylinder 8.
• Check and replace faulty oxygen sensor in cylinder 8.
• Perform a compression test to check for any internal engine issues in cylinder 8.

Common causes

Most likely first

1. Faulty spark plug on cylinder 8
2. Ignition coil malfunction on cylinder 8
3. Fuel injector issue on cylinder 8
4. Low compression on cylinder 8
5. Engine control module (ECM) failure

How to diagnose & fix

Work through it in order

1. Engine misfires or runs rough
2. Decreased engine performance or power
3. Poor fuel efficiency
4. Illuminated check engine light
5. Engine knocking or pinging