The ignition advance allows for richer air/fuel mixtures at start-up.

The ignition advance allows for richer air/fuel mixtures at start-up.

• A. True
• B. False
• C. Not enough data
• D. Not applicable

Answer: (A)

When an engine starts, it often needs a richer air/fuel mixture to ignite reliably in the cold, dense charge. Ignition advance means firing the spark earlier in the compression stroke. Advancing the spark at start gives the flame more time to develop before the piston reaches top dead center, which helps the richer mixture burn more effectively and reduces the chance of misfires. So, ignition advance is used together with starting enrichment to ensure a smooth, reliable start with a richer mixture.

When an engine starts, it often needs a richer air/fuel mixture to ignite reliably in the cold, dense charge. Ignition advance means firing the spark earlier in the compression stroke. Advancing the spark at start gives the flame more time to develop before the piston reaches top dead center, which helps the richer mixture burn more effectively and reduces the chance of misfires. So, ignition advance is used together with starting enrichment to ensure a smooth, reliable start with a richer mixture.