V 3500 P/U 4WD V8-350 5.7L VIN M 4-bbl (1987)
![background image](/gmc/v_3500_p/u_4wd/v8-350_5.7l_vin_m_4-bbl/Page-654002.png)
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.