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03-10-2
  • DRIVEABILITY - COMPRESSED NATURAL GAS (CNG) - ROUGH IDLE OR NO START WHEN COLD - VEHICLES EQUIPPED WITH CNG BI-FUEL ENGINE ONLY
Publication Date: May 13, 2003

FORD:
1996-2000 CONTOUR
1996-2002 F-150
1998-1999 E SERIES

Article 01-23-1 is being republished in its entirety to update the model years and to update the Service Procedure to replace the Low Flow Injectors and not the Compuvalve assembly.

ISSUE:

Due to possible regional Fuel Quality issues in some areas, it may be necessary to clean the low flow injectors in the Compuvalve, and the associated fuel introduction hardware between the Compuvalve and intake manifold (fuel rails, injector sleeves). Typical symptoms of contamination in the low flow injectors are:

  • Rough run in Alt fuel mode most noticeable at idle, runs OK in gasoline mode
  • No start (green light on) when vehicle is cold in Alt fuel mode, but will start if vehicle has been previously warmed up in gasoline mode
  • No start in Alt fuel mode (with green light on) at any time, but starts in gasoline mode.

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