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 MANUALSMERCURY1987GRAND MARQUIS LS, 2D SEDANREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMFUEL INJECTION SYSTEM - MULTI-POINTREMOVAL & INSTALLATIONNOTES
1987 Mercury Grand Marquis LS, 2D Sedan
Removal & Installation: Notes
1987 Mercury Grand Marquis LS, 2D SedanSECTION Notes
Before completely removing fuel charging assembly or working on component parts while installed on engine, following steps MUST be performed:
- Open hood and install protective covers.
- Turn ignition off.
- Disconnect negative battery lead.
- On 1.9L 2.3L,and 2.3L Turbo models, drain coolant.
- Remove fuel cap to relieve tank pressure.
- Release system pressure using pressure gauge at fuel pressure relief valve.
- On 1.9L and 3.0L models, disconnect fuel supply and return lines.
- On 1.9L models, disconnect injector wiring harness by disconnecting ECT sensor in heater supply tube under lower intake manifold. Disconnect air by-pass connector from EEC harness.
- On 3.0L models, disconnect wiring harness at injectors, TPS, air by-pass valve and ACT 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.