Instead of a static number, you need to use a timing light and follow the procedure outlined in your vehicle's repair manual. The manual will specify how to properly set the timing using the distributor's adjustment. The timing will be set to a specific advance (degrees BTDC - Before Top Dead Center) at idle, and then the mechanical advance within the distributor will handle the rest at higher RPMs.
To find the correct timing, you MUST consult your 1986 Toyota 22R repair manual. This manual will give you the specific procedure, including:
* Proper connection of a timing light: This is crucial for accurate readings.
* Location of the timing marks on the crankshaft pulley: You'll need to find these marks to make the measurement.
* Idle speed RPM: The timing will be adjusted with the engine idling at the correct RPM.
* Vacuum advance connection: Ensure the vacuum advance is properly connected and functioning. Incorrect vacuum can affect the timing substantially.
Trying to find the specification without a manual is risky and could damage your engine. A poorly set ignition timing can lead to reduced fuel efficiency, poor performance, and even engine damage. Investing in a repair manual is a worthwhile investment for any vehicle owner.
