1995 Mercury Villager GS Rough Running Engine


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1995 Mercury Villager GS Rough Running Engine

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Microstew
New User

Mar 30, 2011, 7:05 AM

Post #1 of 3 (8242 views)

1995 Mercury Villager GS Rough Running Engine	Sign In

1995 Mercury Villager GS, 3.0L with 110,000 miles. Engine runs rough after it runs good at first. Seems to start and run fine when cold. After it warms up it runs really rough up to quitting. New plugs and wires, a fuel pressure regulator, a coil, a fuel pump were all tried to no avail. Can't seem to hear any vacuum leak. Can you come up with any idea what the problem might be?
Thank, Microstew

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Mar 31, 2011, 3:16 AM

Post #2 of 3 (8234 views)

Re: 1995 Mercury Villager GS Rough Running Engine	Sign In

For vacuum leaks, I use carb cleaner at suspect areas with less than fully warmed up engine. A trouble spot should change the idle speed if one found and nothing visually seen.

I find it rare but others don't - there's a sensor for how warm the engine is called a CTS = coolant temp sensor near thermostat usually that tells the computer how much fuel to deliver. It might be a bad connection or might be bad telling the computer engine is always cold and confuses the whole thing. If it was always in cold mode it would probably be using tons more fuel up to smelling it or seeing black out exhaust. A code reading could help with this too but 95 models and older didn't have as wide a range of info to offer but still can read codes. Not all places have the code reader for what is OBDI systems which is almost all vehicles pre 1996. TMK - there are only a couple of MY 1995s that had OBDII still in use now,

T

OBD = On Board Diagnostics
MY is acronym for Model Year

(This post was edited by Tom Greenleaf on Mar 31, 2011, 3:18 AM)

zmame
Veteran / Moderator
zmame profile image

Mar 31, 2011, 3:43 PM

Post #3 of 3 (8219 views)

Re: 1995 Mercury Villager GS Rough Running Engine	Sign In

Common problem with these vans are Cam sensors you can verify cam sensor problems with a timing light. Hook the light up and get your readings it should be erratic or just plain wrong. Most of the time cleaning the cam sensor fixes this issue. To clean the sensor remove cap and rotor you will see a optical disc (metal plate with small slots in it).. remove the screws from the plate and remove the plate. You will see a optical sensor clean with senor safe throttle body cleaner. also hold the disc up to a light source and make sure non of the slots are plugged.. If that fails you will probably be into replacing the distributor as you can't get the optical sensor separate.

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