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 MANUALSCHEVROLET1993CAMARO Z28, STANDARD, M29REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - BASIC TESTINGNO START DIAGNOSIS (A-3)NO START - ENGINE CRANKS OKAY (4.9L WITH HEI DISTRIBUTOR)FUEL SYSTEM
1993 Chevrolet Camaro Z28, Standard, M29
Fuel System
1993 Chevrolet Camaro Z28, Standard, M29SECTION Fuel System
- Prior to checking fuel system for a no-start condition, check ignition for proper spark. Check for proper fuel pump pressure and capacity. See BASIC FUEL SYSTEM CHECKS.
- Disconnect injector harness. Turn ignition on and check for battery voltage at each injector harness. See Fig 1 or Fig 2 . Battery voltage should be present on one side of each injector connector. If battery voltage is not present, check for blown injector power fuse. If battery voltage is present on both injector terminals, check for wires shorted together.
- If battery voltage is present on only one terminal, connect injector test light to injector harness. Crank engine and note light. Repeat on other injector connectors. If light flashes, check for stored ECM codes. If no codes are present, refer to HARD START symptom in TESTS W/O CODES article in the ENGINE PERFORMANCE Section.
- If light does not flash, disconnect distributor 5-wire connector. Momentarily touch test light from battery voltage to PCM RPM reference wire (circuit No. 430) of 5-wire connector. Each time test light is removed from PCM RPM reference terminal, injector test light should flash. If test light does not flash, check for open in RPM reference wire or injector drive (ground) circuit or replace faulty PCM.
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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.