• Tiny
  • Rchitty
  • 1986 Mercury Marquis

Engine Mechanical problem
1986 Mercury Marquis V8 Two Wheel Drive Automatic 120468 miles

Hello, I have an 86 marquis, 5liter. I can't get it to start. I've done everything I can think of.

-Battery good at 12.4V, starter turns over engine
-Removed spark plugs one at a time, grounded off, all of them arced fine.
-Removed & cleaned the Dist. Cap
-Checked the inertia switch in the trunk
-Fuel pump works & was replaced about 1.5 years ago, has fuel
-Tried using quick start fluid to eliminate the ignition system, but start fluid did NOTHING. Even tried carb/throttle cleaner. Still nothing.
-All fluids good, tune up was done about 6 months ago

Any thoughts or suggestions would be greatly appreciated! Thanks!

Wednesday, October 13th, 2010 AT 9:35 PM

1 Answer

  • Tiny
  • rasmataz
  • Member

Check the fuel pressure to rule out the fuel filter/fuel pump/pressure regulator and listen to the injector/s are they pulsing or hook up a noid light.

Fuel pressure specifications: Key On Engine Off 35 - 45 psi
Key On Engine Running 27-37 psi
Engine Running Vacuum Hose Disconnected From Pressure Regulator 40 - 45 psi

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Wednesday, October 13th, 2010 AT 9:53 PM

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