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 MANUALSCHEVROLET1987BLAZER FULL SIZE V8-305 5.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATIONMODES OF OPERATIONSTARTING MODE (PORT AND TBI INJECTION)
1987 Chevrolet Blazer Full Size V8-305 5.0L
Starting Mode (Port and TBI Injection)
1987 Chevrolet Blazer Full Size V8-305 5.0LSECTION Starting Mode (Port and TBI Injection)
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.
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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.