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Propane Enrichment Procedure Vehicle Preparation

  1. Apply parking brake and block wheels. Check ignition timing. Readjust if necessary. Remove air cleaner assembly. Disconnect wiring harness from carburetor feedback solenoid at rear of carburetor.
  2. Remove PCV valve from valve cover and allow it to draw fresh air. Disconnect fuel evaporating purge line at purge solenoid. Install adapter into end of purge line, (from intake manifold spacer). Install Purge Line Tester (T84T-9600-A) into end of purge line still connected to intake manifold spacer.
  3. Disconnect ISC motor from wiring harness by connecting tachometer to engine, starting engine and manually holding throttle above 1000 RPM. Push ISC plunger until it fully retracts. After plunger retracts, release throttle and quickly unplug connection.
  4. Be sure throttle lever is resting on speed screw and engine is at Anti-Dieseling RPM specification. Install air cleaner assembly, but do not connect flexible fresh air tube to air cleaner duct and valve assembly.
  5. Insert propane hose about 3/4 of the way into duct and valve assembly. If necessary, secure hose with tape.
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