Ignition timing angle — check (Opel Omega A)

1. Checking the ignition timing is not possible on the 2.0 litre engine equipped with the Motronic engine management system. On the 1.8 litre engine the ignition timing can be checked as described in the following points, although no adjustment is possible as it is carried out automatically by the electronic control unit. The procedure can be used if damage is suspected or if any of the ignition system components have been replaced.

2. Start the engine, warm it up to normal operating temperature, then turn it off.

3. On carbureted models, disconnect the vacuum hose from the electronic control unit located in the right rear corner of the engine compartment.

4. On fuel injection versions, disconnect the connector from the throttle switch, connect together with jumpers terminals 18, 3 and 2 inside the connector.

5. Connect the tachometer and strobe light to the engine (cylinder #1 from the front of the engine).

6. Check that the octane plug near the brake booster is set to "98" on the black plastic clip. If it is set to 95, unclip the plug, twist it around.

7. Start the engine and accelerate it to the specified speed.

8. Aim the timing light at the left side of the crankshaft pulley and check that the notch in the pulley is aligned with the pointer on the rear drive cover.

9. Stop the engine. Install the throttle switch connector or control unit vacuum hose, if equipped.

10. If the ignition timing is checked again, the advanced timing should be set as per Specifications. There are no additional marks on the crankshaft pulley, however some timing lights may have a method for setting the timing by reading the value obtained in step 8, then reading the advanced timing after completing the procedure given in step 9. Alternatively, the crankshaft pulley may be marked in degrees.



11. Turn off the engine, disconnect the tachometer and stroboscope.

12. If necessary, reinstall the octane plug to the required position.