HEI System Tests

WARNING: This page is about a different car, the 1989 Cadillac Allante. However, it is still accessible from the selected car via links, so may be relevant.

For HEI diagnosis, see Fig 1 and Fig 2 .

Fig 1: Intermittent Operation Or Miss Flow Chart

Courtesy of GENERAL MOTORS CORP.

Fig 2: Engine Cranks, But Will Not Start (With Integral Ignition Coil) Flow Chart

Courtesy of GENERAL MOTORS CORP.