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 MANUALSPONTIAC1988FIREBIRD BASE, 5.0 E, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETUNE-UPIGNITION SYSTEM - HEI-ESTTESTINGESC PERFORMANCE CHECKNON-CONTROLLER EQUIPPED
1988 Pontiac Firebird Base, 5.0 E, Standard
Non-controller Equipped
1988 Pontiac Firebird Base, 5.0 E, StandardSECTION Non-controller Equipped
- With engine at normal operating temperature, increase engine speed to about 1500 RPM. Tap on engine lift hook bracket while observing engine timing. If timing retards system is operating properly.
- If timing did not retard in step 1), disconnect knock sensor. Connect voltmeter positive lead to knock sensor and negative lead to ground. Set voltmeter on 2-volt AC scale.
- Tap on engine block near knock sensor. Voltage should be indicated while tapping on block. If voltage is indicated, check for improper installation of MEM-CAL. If installed properly, replace faulty MEM-CAL or ECM. If voltage is not indicated, replace knock sensor.
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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.