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4-Cylinder Ignition Timing: G20

  1. Start engine, and warm it to normal operating temperature (needle is in middle of coolant gauge). Operate engine for 2 minutes at 2000 RPM. Perform self-diagnostic procedure, and check for smooth engine operation. See G - TESTS W/ CODES article in the ENGINE PERFORMANCE Section.
  2. Turn engine off. Disconnect throttle position sensor connector, and restart engine. Increase engine speed to 2000 RPM, 2 or 3 times, and then allow engine to return to idle.
  3. Connect timing light to cylinder No. 1 spark plug cable. Check ignition timing. See IGNITION TIMING  table. If necessary, adjust timing by loosening distributor mounting bolts and turning distributor. With ignition timing correctly set, check idle speed and mixture. See IDLE SPEED & MIXTURE. Reconnect throttle position sensor connector.
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