Component Tests and General Diagnostics

NOTE: If Air Induction System is functioning properly, refer to Diagnostic Routines for further driveability complaint diagnosis.
- Visually inspect all flange joints for indications of leaks.
- Connect a HEGO sensor monitor box to read rich/lean state of the HEGO sensors.
- Bring engine to normal operating temperature.

WARNING: The vehicle MUST be in a well ventilated area away from any source of spark or flame when using propane.

- With the engine idling in Neutral (M/T) or Park (A/T) and the parking brake ENGAGED, spray small amounts of propane around the following possible sources of air leaks:

^ Bypass hose connections at the rear of the supercharger.
^ Flange joint:
- At rear of the supercharger.
- At rear of the supercharger outlet adapter.
^ Four tube joints at:
- Supercharger outlet to the upper tube.
- Upper intercooler inlet.
- Lower intercooler outlet.
- Intake manifold adapter inlet.
^ Intake manifold adapter to intake manifold flange.

- When propane is sprayed near an induction system air leak, the HEGO monitor box will indicate "RICH" for one or two seconds, then return to normal switching. When the propane is removed from the leak, the HEGO monitor box will indicate "LEAN" after one or two seconds.

- If a leak is found, the entire system must be disassembled and the sealing surfaces cleaned.

NOTE: It is important that the intercooler tubes seal completely. Make sure there are no foreign particles on the sealing surfaces of the tubes. The engine uses a Mass Air Flow system to calculate fuel flow. Any leak will cause poor operation and performance. Use only Teflon Tape (ESE-M4G169-B) to seal the system.