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 EST (Electronic Spark Timing) 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).

PICK-UP COIL RESISTANCE (OHMS)

Application

Resistance

All Models ⁽¹⁾

500-1500

⁽¹⁾	Not equipped on 2.3L "Quad-4".

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Ignition System: Distributor