Tune-Up - 4 CYL: Distributor

All engines except 1.6L System A use the Electronic Spark Timing (EST) High Energy Ignition (HEI) distributor. This distributor uses a 7-terminal HEI module and does not have vacuum or mechanical advance. The 1.6L System A engine uses a conventional HEI distributor with vacuum and mechanical advance.

Fig 1: 1.6L Firing Order & Timing Marks

Courtesy of GENERAL MOTORS COMPANY

Fig 2: 2 1.8L, 1.8L OHC & 2.0L Engine Firing Order

Courtesy of GENERAL MOTORS COMPANY

Fig 3: 2.5L Firing Order & Timing Marks

Courtesy of GENERAL MOTORS COMPANY