DR-21A Checking Basic Ignition Timing

This test must be performed with engine warm.

1. Connect a tachometer to engine, then connect a power timing light to engine.
2. Start and run engine until normal operating temperature is reached, then disconnect and reconnect engine coolant sensor connector. Power loss lamp on instrument panel must come on.
3. If basic timing is within 2° of specifications, proceed to Test 21 step B. DR-21B Checking Spark Advance
4. If basic timing is not within 2° of specifications, adjust following basic ignition timing procedure.