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1991 Chevrolet R3500 Cheyenne, Vacuum/Pressure/Flow Waveform
Channel A 1mv/ InHg at TBI on PCV port. Channel B 1mv/ amp starter B+ feed. Trigger is channel B. Comparison of cranking vacuum and starter current draw. Gives a time relationship to vacuum level. Looks like max cranking vacuum is reached in less than one engi...
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| Engine | 5.7 L / 8 cyl / GAS |
| Trans | 4-speed AutomaticTransmission (Electronic) |
| Delivery | Fuel Injection |
| Subsystem | Engine/Propulsion |
| Component | |
| Condition | Known Good |
Vehicle Data
1991 Chevrolet R3500 Cheyenne 5.7L
| Engine | 5.7 L / 8 cyl / GAS |
| Trans | 4-speed AutomaticTransmission (Electronic) |
| Delivery | Fuel Injection |
| Subsystem | Engine/Propulsion |
| Component | |
| Condition | Known Good |
Video