Symptoms. Chevrolet Metro 2000

For 1990-2009 cars

### Important Preliminary Checks Before Starting

Perform the Powertrain On Board Diagnostic (OBD) System Check , and verify that all of the following are true before using the Symptom Tables:

• | The PCM and the MIL are operating correctly.

• | Check that there are not any DTCs that are stored.

• | The scan tool data is within the normal operating range.

• | Verify the customer complaint, and locate the correct symptom in the table. Check the items that are indicated under that symptom.

Several of the symptom procedures call for a careful visual inspection and/or for a physical inspection. You MUST perform the careful visual inspection and/or the physical inspection. The Careful Visual/Physical Check is an important procedure that can lead to the correction a concern without further diagnosis. The performance of the careful visual inspection and/or of the physical inspection can save time. The careful visual inspection and/or the physical inspection should include the following:

• | Inspect all PCM grounds for secure connections and for clean connections that are in the correct location.

• | Check for split vacuum hoses, for kinks, and for correct connections, like shown on the label of the Vehicle Emission Control Information. Check the vacuum hoses thoroughly for any type of leak or for a restriction.

• | Inspect the air inlet ducts for collapsed sections or for restricted sections.

• | Check for air leaks at the mounting area for the throttle body and at the intake manifold sealing surfaces.

• | Inspect the secondary wires in the ignition system for cracking, for hardening, for carbon tracking, and for the correct routing to each cylinder.

• | Inspect the wiring harness for correct connections and for damage.

Refer to the following tables for more symptom-based diagnostics.

• | Hard Start

• | Surges/Chuggles

• | Lack of Power, Sluggishness, or Sponginess

• | Detonation/Spark Knock

• | Hesitation, Sag, Stumble

• | Cuts Out, Misses

• | Poor Fuel Economy

• | Poor Fuel Fill Quality

• | Rough, Unstable, or Incorrect Idle and Stalling

• | Dieseling, Run-On

• | Backfire

• | Restricted Exhaust System Check