The firing order is 1-3-4-2 (No. 1 cylinder at crankshaft pulley end).
Here is some information on how to check/adjust the timing:
Note: Accurate ignition timing is only possible using a stroboscopic timing light, although on some models a DC sender unit is located on the top of the gearbox casing and may be used with a special VW tester to give an instant read-out. However, this tester will not normally be available to the home mechanic TCI-H
Run the engine until its normal operating temperature is reached.
On 1.05, 1.3 and 1.8 fuel injection engines, disconnect and plug the distributor vacuum hose.
If there are no timing marks on the timing cover and crankshaft pulley, unscrew and remove the TDC sensor or blanking plug from the top of the gearbox.
Connect a timing light in accordance with the manufacturer's instructions.
Connect a tachometer in accordance with the manufacturer's instructions.
Start the engine and run it at idling speed.
Point the timing light at the timing mark and pointer which should appear to be stationary and aligned. If adjustment is necessary (ie. the marks are not aligned), loosen the clamp retaining bolt and turn the distributor body to correct the ignition timing (see illustration 17.17).
Gradually increase the engine speed while still pointing the timing light at the timing marks. The mark on the flywheel or pulley should appear to move opposite to the direction of rotation, proving that the centrifugal weights are operating correctly. If not, the centrifugal mechanism is faulty and the distributor should be renewed.
Accurate checking of the vacuum advance (and ****** where fitted) requires the use of a vacuum pump and gauge. However,providing that the diaphragm unit is serviceable, the vacuum hose(s) firmly fitted,and the internal mechanism not seized, the system should work correctly.
Switch off the engine, remove the timing light and tachometer, and refit the vacuum hose (where applicable).Digifant
Run the engine to normal operating temperature, then switch off the ignition.
Connect a stroboscopic timing light to the engine.
Run the engine at idle speed.
Disconnect the wiring from the temperature sender (see illustration).
Increase the engine speed to between 2000and 2500 rpm, then point the timing light at the aperture over the flywheel. The timing marks should be aligned (see illustration 17.17), but if not, loosen the clamp bolt, turn the distributor as required and re-tighten the bolt.
While checking the ignition timing, the opportunity should be taken to check the temperature and knock sensor controls.
With the temperature sender wiring disconnected, increase the engine speed to 2300 rpm and note the exact ignition timing.Hold the engine speed at 2300 rpm, then reconnect the wiring and check that the ignition timing advances by 30°±3°from the previously noted value.
If the ignition timing only advances about20°, slacken the knock sensor securing bolt,re-tighten to 20 Nm (15 Ibf ft) and repeat the test. If there is no difference, check the associated wiring for an open-circuit, or as a last resort, renew the knock sensor.
If there is no advance in ignition timing,check the temperature sender wiring for an open-circuit. A fault is indicated in the Digifant control unit if there is no open-circuit.