Cylinder 4 Injection Timing Performance Over Advanced

Common symptoms

What you'll notice

• Check the fuel injectors for any clogs or blockages
• Inspect and clean the fuel system, including the fuel pump and fuel filter
• Verify proper ignition timing and adjust if necessary
• Check the engine control module (ECM) for any software updates or reprogramming needed
• Perform a compression test on cylinder 4 to check for any internal engine issues

Common causes

Most likely first

1. Faulty fuel injector in cylinder 4
2. Timing belt or chain stretched or worn
3. Incorrect ignition timing
4. Malfunctioning engine control module (ECM)
5. Clogged fuel filter in cylinder 4 fuel line

How to diagnose & fix

Work through it in order

1. Engine misfires or runs rough
2. Poor fuel efficiency
3. Irregular or uneven engine idle
4. Engine hesitation or stalling
5. Check Engine Light (CEL) illuminates