E 150 1/2 Ton Van V6-4.2L VIN 2 (1997)
Air/Fuel Mixture: Testing and Inspection
To avoid potential misdiagnosis and the unnecessary replacement of components, it is recommended that diagnosis and testing begin with Diagnostic
Routines (Diagnosis by Symptom) at the Powertrain Management level.
The Diagnostic Routines will lead the technician through the logical and methodical testing of a "specific" subsystem and it's related wiring and
components.
