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 MANUALSPONTIAC1987FIREBIRD FORMULA, 5.0 H, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEIGNITION SYSTEMIGNITION SYSTEM - HEI-ESTTESTINGEST SYSTEM CHECKFUEL INJECTED ENGINES
1987 Pontiac Firebird Formula, 5.0 H, Automatic
Fuel Injected Engines
1987 Pontiac Firebird Formula, 5.0 H, AutomaticSECTION Fuel Injected Engines
- The ECM will set timing at a specified value when the "TEST" terminal is grounded.
- Note timing when terminal is not grounded. Ground "TEST" terminal and check for timing change at 2000 RPM. If timing changes, the EST is operating properly.
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.