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.
1990 Ford Probe GL, AutomaticFACTORY OEM SERVICE PROCEDURE
5.0L Symptom-To-Diagnostic Flow Chart Menu
5.0L EEC-IV SYMPTOM DIAGNOSTIC
| Symptom | Go To: Circuit Test (Step No.) | ||
|---|---|---|---|
| Engine Runs Rough Or Misses, Lack Of Power, Idle Erratic, RPM Surges, Hesitation (1) | S (2) | ||
| Stalls In Self-Test, Engine Stalls | S (1) | ||
| A/C Does Not Cut Off Under WOT Condition | KM (15) | ||
| A/C Not Functioning | KM (1) | ||
| Low Idle With A/C On | FA (11) | ||
| Stumble After Hot Restart | H (20) | ||
| Fuel Pump Runs With Engine Off (Except MA Models) | J (22) | ||
| Gasoline Fumes Under Hood | KD (1) | ||
| Black Exhaust Smoke | H (29) | ||
| Shift Indicator Light Always On Or Off (MA Models) | KL (1) | ||
| "CHECK ENGINE" Or "SERVICE ENGINE SOON" Light Always On | ML (1) | ||
| "CHECK ENGINE" Or "SERVICE ENGINE SOON" Light Never On | ML (5) | ||
| "CHECK ENGINE" Or "SERVICE ENGINE SOON" Light On Intermittently | ML (10) | ||
| "CHECK ENGINE" Or "SERVICE ENGINE SOON" Light Flashing With Erratic Idle | ML (15) | ||
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Factory Service Tools
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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.
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