Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1990R 30 P/U 2WD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONOPERATING MODESSTARTING MODE
1990 Chevrolet R 30 P/U 2WD V8-350 5.7L
Starting Mode
1990 Chevrolet R 30 P/U 2WD V8-350 5.7LSECTION Starting Mode
When the ignition switch is rotated to the "On" position, the ECM energizes the fuel pump for two seconds and fuel pressure is built up to the TBI unit. The ECM then checks the coolant temperature sensor, the TPS and determines the proper air/fuel mixture for starting.
The ECM controls the air/fuel ratio by changing the length of time the injectors are turned on and off. This is accomplished by "Pulsing" the injectors for short periods of time.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.