Intermittent Diagnostic Techniques: Notes

WARNING: This page is about a different car, the 2004 Ford Pickup Heritage. However, it is still accessible from the selected car via links, so may be relevant.

Intermittent diagnostic techniques help find and isolate the root cause of intermittent faults associated with the system. The material is organized to isolate the fault and perform the repair. There are examples that illustrate the diagnostic techniques. The process of finding and isolating an intermittent fault starts with recreating the fault symptom, accumulating and comparing data to typical values and analyzing the results.

Before proceeding be sure that:

Customary mechanical system tests and inspections do not reveal a problem. (Remember, mechanical component faults can make an alternative fuel system react abnormally.)
Technical Service Bulletins (TSBs), if available, have been reviewed.
Quick Test and associated pinpoint test diagnosis has been completed without locating a fault, and the symptom is still occurring.
Customer Information Worksheet and the Bi-Fuel Driveability Diagnostic Form (located in REFERENCE VALUES - BI-FUEL CNG ) have been utilized to record customer information and test data during diagnosis.