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 MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 68 (ENGINE CONTROLS - TESTS W/O CODES - EEC-IV (4.6L))
1991 Mercury Tracer Base, 4D Sedan, Automatic
Section 68 (Engine Controls - Tests W/O Codes - EEC-IV (4.6L))
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Section 68 (Engine Controls - Tests W/O Codes - EEC-IV (4.6L))
WARNING: This page is about a different car, the 1994 Mercury Grand Marquis, 1994 Lincoln Town Car, 1994 Lincoln Mark VIII, and 1994 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Symptoms
- Symptoms Diagnosis
- No Crank
- Hard Start/Long Crank
- Stalls After Start
- No Start/Normal Crank
- Slow Return To Idle
- Rough Idle
- High Idle (Diesels/Runs On)
- Low Idle (Stalls On Deceleration)
- Hesitates Or Stalls
- Surge (On Acceleration Or Cruise)
- Backfires
- Loss Of Power
- Spark Knock
- Poor Fuel Economy
- Emissions Compliance
- Warning Indicator Lights
- Improper Transmission Shift
- Tachometer Inoperative
- High Oil Consumption
- Engine Runs Hot
- Engine Runs Cold
- Exhaust Smoke
- Gas Smell
- Engine Noise
- Vibration
- Climate Control (Lack Of Cooling)
- Climate Control (A/C Always On)
- A/C Clutch Does Not Disengage Under Wot Conditions
- INTERMITTENTS
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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.