Adjusting the timing on a VW Jetta with a distributor is a simpler project than in many cars but still requires a clear understanding of engine mechanics. Adjusting the timing on a VW Jetta is required to make the most of many aftermarket performance parts or after changing the timing chain. A VW Jetta with a distributorless ignition system requires professional reprogramming of the vehicle's on-board computer.
Remove the timing check hole, above the flywheel on manual transmission models. Connect a timing light to the battery and then to the number one ignition wire at the far right of the engine.
Start the VW Jetta engine and allow it to reach normal operating temperature. You have reached normal operating temperature when the cooling fan cycles on and off one time.
Let the engine idle normally and point the timing light through the timing check hole or at the crank pulley at the front of the engine. Determine the amount of adjustment needed and turn off the engine.
Loosen the distributor hold down bolts and turn the distributor slowly. Restart the car and check the timing again. Repeat the process until the timing mark lines up with the middle line on the timing light.
Tighten the distributor hold down bolts and recheck the timing to ensure nothing moved in the process. Remove the timing light and reconnect the number one ignition wire.
