Tune-Up - 4-CYL: Distributor

• The 2.0L (VIN 1) and 2.5L engines use a Direct Ignition System (DIS). This system is similar to the C(3)I Ignition used on some Buick-built V6 engines. Ignition timing information is taken from a crankshaft mounted timing disc by a magnetic sensor.
• The 2.3L "Quad-4" engines use the Integrated Direct Ignition (IDI) and does not use the conventional distributor and coil. The system consists of two separate ignition coils, an ignition module and a secondary conductor housing mounted to the aluminum cover plate. This system utilizes the Electronic Spark Timing (EST) signal from the ECM to control spark timing.
• All other models with distributors are equipped with the Delco-Remy High Energy Ignition system with Electronic Spark Timing (HEI-EST). The HEI-EST distributor is not equipped with centrifugal or vacuum advance mechanisms since all advance is controlled by the Electronic Control Module (ECM).

Fig 1: 2.0L (VIN K & M) Firing Order & Timing Marks

Fig 2: 2.0L (VIN 1) Firing Order & Timing Marks

Fig 3: 2.3L (VIN D) Firing Order & Timing Marks

Fig 4: 2.5L (VIN R) Firing Order & Timing Marks

Fig 5: 2.5L (VIN U) Firing Order & Timing Marks