C 3500 1 Ton Pickup 2WD L6-292 4.8L VIN T 1-bbl (1984)
Fig. 44 Vacuum servo EFE diagnosis chart
Refer to Figs. 43 and 44 for EFE diagnosis on all except 4-119 engines and models with C-3 system control. On 4-119 engines, check that operation
is consistent with description outlined previously.