For 1990-2009 cars

### Important Preliminary Inspections Before Beginning

Before using this section, perform the Diagnostic System Check - Vehicle and verify all of the following conditions:

• | The powertrain control module (PCM) and the malfunction indicator lamp (MIL) are operating correctly. Refer to Malfunction Indicator Lamp (MIL) Inoperative .

• | Diagnostic trouble codes (DTCs) are not stored.

• | The scan tool data is within the normal operating range. Refer to Scan Tool Data List .

• | Verify the customer concern and locate the correct symptom table. Inspect the items indicated in that symptom table.

• | Several of the symptom procedures ask for a careful visual/physical inspection. This step is extremely important, and can lead to correcting a condition without further inspections and can save valuable time.

• | If the intermittent condition exists as a start and then stall, inspect for any DTCs related to the theft deterrent system. Refer to Diagnostic System Check - Vehicle .

• | Verify the proper installation of any of the following aftermarket accessories:

- | Lights

- | Cellular phone

- | Remote starter system

- | Aftermarket installed alarm

• | Use the following tables when diagnosing a symptom concern:

- | Poor Fuel Fill Quality

- | Hard Start

- | Surges/Chuggles

- | Lack of Power, Sluggishness, or Sponginess

- | Detonation/Spark Knock

- | Hesitation, Sag, Stumble

- | Cuts Out, Misses

- | Poor Fuel Economy

- | Rough, Unstable, or Incorrect Idle and Stalling

- | Dieseling, Run-On

- | Backfire

• | If the condition cannot be isolated using the appropriate table, refer to Intermittent Conditions for further diagnosis.