Cylinder 12 Injection Timing Performance Over Retarded

Common symptoms

What you'll notice

• Check and replace the fuel injector in cylinder 12.
• Inspect and clean the fuel lines feeding cylinder 12.
• Verify and adjust the ignition timing for cylinder 12.
• Inspect the compression in cylinder 12 and perform any necessary repairs or replacements.
• Check and update the engine control unit (ECU) software to ensure proper timing in cylinder 12.

Common causes

Most likely first

1. Incorrect fuel injection timing settings
2. Worn or damaged injector
3. Faulty fuel pressure regulator
4. Clogged or dirty fuel filter
5. Engine misfire

How to diagnose & fix

Work through it in order

1. Engine misfiring or rough idle
2. Decreased acceleration or sluggish engine performance
3. Increased fuel consumption
4. Difficulty starting the engine
5. Illuminated check engine light