Ignition - Specifications, Timing Marks, And DIS Testing
Group: 28Number: 82-04
Date: November 30, 1982
Subject: Ignition System
Key Points: Ignition Specifications, Cutting Flywheel Timing Mark and Idle Stabilization System Trouble Shooting Procedure
Part Identifier: N/A
Ignition Specifications - Rabbit/Jetta/Scirocco
Ignition Specifications - Quantum
Flywheel
(cars with manual transmission)
Note:
Flywheels supplied as spare parts have TDC mark 0 only
Rabbit/Jetta/Scirocco
- when installing new flywheel, cut ignition timing mark notch into flywheel distance a to left of TDC mark 0 (see illustration)
^ a = 12 mm (0.472 inch)
Quantum
- when installing new flywheel, cut ignition timing mark notch into flywheel distance a to left of TDC mark 0 (see illustration)
^ a = 14 mm (0.551 inch)
Idle Stabilizer, Checking
^ 1 = idle stabilizer
^ 2 = Hall control unit
^ 3 = plug connectors
Note:
If engine is hard to start and stalls, check for possible problem in idle stabilization system as follows
- pull plugs 3 out of idle stabilizer 1
- check pins and sockets for corrosion and damage
- connect both plugs 3 together
- start engine
- if engine now starts and does not stall, connectors are OK: idle stabilizer is defective and must be replaced
Idle stabilization system, checking
- with plugs 3 connected to idle stabilizer 1, connect Siemens 451 or VAG 1367 tester
- set parking brake
Warning:
Make sure during following tests that no one is in front of car
Cars with manual transmission
- start engine
- run engine at idle speed
- read ignition timing on tester and note
- shift into 4th gear and release clutch slowly
^ ignition timing reading on tester must advance when rpm of engine drops below 840 rpm
- if no, replace idle stabilizer
Cars with automatic transmission
- start engine and wait until engine speed drops below 1,000 rpm
- run engine at idle speed
- read ignition timing on tester and note
- switch off A/C (if installed)
- switch on all electrical equipment, such as head light, rear window defogger etc.
- apply brake pedal
- move shift lever into gear
^ ignition timing reading on tester must advance when engine RPMs drop below 840 rpm
- if no, replace idle stabilizer