Technical Service Bulletins
|Publication Date: JUNE 19, 2000|
|1996 CONTOUR, ECONOLINE, F-150, F-250|
Some vehicles may exhibit false high spark advance readings when using a New Generation Star (NGS) Tester. On some bi-fuel vehicles, when the Powertrain Control Module (PCM) is operating with less spark advance than base timing, the NGS Tester will display a very large number.
When the NGS, using the N1-125/N1-124 card/cable (Rotunda 164-R0905/164-R0906 card/cable), displays a spark advance of more than 328 degrees, the technician must subtract 655 from the number displayed to calculate the spark retard value.
OTHER APPLICABLE ARTICLES:
490000, 615000, 615500, 690000