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 MANUALSPONTIAC1987FIERO BASE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMFUEL INJECTION SYSTEM - PFITROUBLE SHOOTINGHARD START
1987 Pontiac Fiero Base, Automatic
Hard Start
1987 Pontiac Fiero Base, AutomaticSECTION Hard Start
NOTE:
If engine starts but dies immediately, see ENGINE CRANKS BUT WON'T RUN diagnostic chart in appropriate COMPUTER ENGINE CONTROL (CEC) article in COMPUTER CONTROLS section.
- Check fuel pump relay by probing fuel pump test terminal with a test light to ground. Turn ignition off for 10 seconds, and then turn ignition on. Test lamp should light for 2 seconds. If test light does not light, fuel pump relay is at fault.
- Check TPS for sticking or binding. Check for high resistance in coolant sensor circuit or sensor itself. Check for faulty in-tank fuel pump check valve. See the FUEL SYSTEM DIAGNOSIS chart in the appropriate PFI TESTS W/ CODES in COMPUTERIZED ENGINE CONTROL section.
- Check for water contaminated fuel. Check EGR operation. Be sure valve seats properly and is not staying open. Check ignition system, particularly the distributor. If problem exists in cold weather, check cold start valve operation.
- Check condition of spark plugs. If engine starts and immediately stalls, open distributor by-pass line. If engine then starts and runs okay, replace pick-up coil. If engine starts and then stalls, disconnect MAF sensor. If engine then runs and sensor connections are okay, replace MAF sensor (if equipped)
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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.