Preliminary Checks

Most driveability problems in the multi-point EFI system are the result of faulty wiring or loose and/or leaking hose connections. To avoid unnecessary testing, check the following before beginning trouble shooting procedures. A preliminary visual check should include:

• Air ducts at air cleaner, turbocharger and throttle body.
• All electrical connections at components.

Check vacuum lines for tight, leak-free connections in these areas:

• Throttle body.
• Solenoid bank.
• Vapor canister.
• PCV valve to turbocharger vacuum port.
• Backpressure transducer.
• MAP sensor.

Ensure the following electrical connectors are properly attached:

• 14-pin and 60-pin connector at SMEC.
• Connectors at ASD relay.
• Connectors at solenoid bank.
• Speed/distance sensor connector (in-line with speedometer cable).
• Charge temperature sensor connector.
• Throttle body connector.
• Fuel injector connectors.
• O2 sensor connector.
• Coolant temperature sensor connector.
• Distributor connectors.
• Connector at detonation sensor.
• Radiator fan relay connectors.
• Ground eyelet mounting onto intake manifold.