1. There are no timing marks on the flywheel or crankshaft pulley. The ignition timing is constantly monitored and corrected by the electronic module of the engine management system, and no nominal values are in Specifications not given. Therefore, the motorist will not be able to check the ignition timing.
2. The only way is to use special diagnostic equipment connected to the diagnostic connector of the engine management system (see related section). For more information, contact your Opel dealer.
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