1986 Mercury Marquis Service and Repair Manual

This factory service and repair manual for the 1986 Mercury Marquis serves a two-engine, two-body range: the 2.3L SOHC inline-four of 140 cubic inches and the 3.8L OHV V6 of 232 cubic inches, naturally aspirated and running on gasoline, in a four-door sedan or four-door wagon wearing Base or Brougham trim. Because the four-cylinder and the V6 share almost nothing but the car around them, the manual treats their overhaul, timing and fuel work as separate jobs rather than variations on one.

Engines covered

• 2.3L inline-four (140 cu in) — SOHC, naturally aspirated, gasoline
• 3.8L V6 (232 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 4-door sedan
• 4-door wagon

Trims covered

• Base
• Brougham

Known issues on the 1986 Marquis. A single recall is recorded: replacement fuel pumps whose diaphragms may have been installed incorrectly or left inadequately tested, allowing the pump to leak and creating a fire hazard. Four owner complaints exist, one each on the fuel system, the wheels and the electrical system. Fuel delivery testing, pressure specifications and line routing are covered here, as are wheel and hub torque values and the body wiring diagrams, the three areas those complaints touch, alongside full engine, transmission and chassis procedures for both engines.