Cylinder 7 Injection Timing Performance Over Advanced

Common symptoms

What you'll notice

• Check and replace the fuel injector for cylinder 7.
• Inspect and clean the fuel injectors for all cylinders.
• Verify and adjust the ignition timing for cylinder 7.
• Check and replace the spark plugs for cylinder 7.
• Inspect and clean the throttle body and intake manifold.

Common causes

Most likely first

1. Faulty fuel injector in cylinder 7
2. Engine control module (ECM) malfunction
3. Ignition timing issue
4. Fuel contamination or blockage in injector
5. Cylinder compression problem

How to diagnose & fix

Work through it in order

1. Engine misfires or runs rough
2. Loss of power or acceleration
3. Difficulty starting the engine
4. Increase in fuel consumption
5. Illuminated check engine light