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Mercury engine repair questions and answers

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  • AutoMD Member
    AutoMD Member - 1996 Mercury Cougar - Engine - 7/27/2014
    Car won't fire enough to start, gradually got worse, now will turn over but not fire. It is getting fuel so coil pack?
    Car would run fine when running just not on start ups, like it wasn't firing on all cylinders at initial start. Gradually got worse. Pulled in the gas station to get gas, got gas and car started but died when I gave it gas, tried starting an messing with it for a ...
     
    • Pepe
      4/11/2014 Pepe
      So it's getting fuel, how do know? did you check it by doing a fuel pressure test? If the car isn't firing the injectors or spark plugs it very well could be the crankshaft sensor. Also have you checked to see if there are any codes stored into the ECU?
    • HouseCallAuto
      4/11/2014 HouseCallAuto
      Is there ignition spark present? You have to check.
    • AutoMD Member
      7/27/2014 AutoMD Member
      The older cougars had a fuel pump reset switch in the trunk behind the trunk pad on the driver side . If you can't find it look in owner's manual. Might be a possible problem.
  • AutoMD Member
    AutoMD Member - 1995 Mercury Tracer - Engine - 7/26/2014
    The engine overheats when the a/c is on but cools down when the heat is turned on .
    The a/c will blow cool air for a while but warms as the temperature gauge rises. I added anti-freeze and the problem got better for a while but within a week the same symptoms returned .
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1995 Mercury Tracer - Engine - 7/26/2014
    Engine over heats when a/c is on and cools down when I change to heat .
    The a/c starts to blow warmer as the temp rises but cools down when I drive faster . I put in coolant and it seemed to work for a few days but now is have same problem .
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1998 Mercury Tracer - Engine - 7/20/2014
    Why does 1998 Mercury Tracer have trouble starting when engine is hot?
    The 1998 Mercury Tracer (manual transmission) has 110,000 miles on it. The car belonged to my dad (he bought it brand new), and he took good care of it. He gave the car to me. For the past few months, this problem occurs regularly. Even when gas tank is full. ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1993 Mercury Tracer - Engine - 7/18/2014
    Why does car turn off when I brake
    When I start car it does an idle surge and act like it want to turn off. I press the gas and it drive just fine but when I brake it start to do the idle surge again if I leave my foot on the brake more then 1 min. or more the car turn off . Odo- 38334 Work ...
     
    0 answer
  • AutoMD Member
    AutoMD Member - 1997 Mercury Sable - Engine - 7/7/2014
    Loss of power on acceleration and jerking whem cruising
    My car started acting up last weekend after sitting for 2 or 3 days without being driven. The engine seems to sputter and bog down when accelerating, but the rpms are at normal levels; just a lack of power. At crusing speed, the car will also hace a jerking motion, ...
     
    • AutoMD Member
      7/7/2014 AutoMD Member
      Not answering...just confirming that my 2004 Mercury Sable is doing the exact same thing! Taking it in tomorrow. Will let you know. I have a question for you...does your car ever smell like old wet grass clippings??
  • AutoMD Member
    AutoMD Member - 1997 Mercury Sable - Engine - 7/7/2014
    Loss of power on acceleration and jerking whem cruising
    My car started acting up last weekend after sitting for 2 or 3 days without being driven. The engine seems to sputter and bog down when accelerating, but the rpms are at normal levels; just a lack of power. At crusing speed, the car will also hace a jerking motion, ...
     
    0 answer
  • brad
    brad - 2006 Mercury Mariner - Engine - 6/25/2014
    Driving in the highway when I put on the air conditioning, the danger light comes on, and the car has to be stopped.
    It runs fine without the A. C. But at a high speed, I can't put the air on. A triangle lights up and says to stop the car immediately . Then it will restart like nothing.
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2004 Mercury Sable - Engine - 6/25/2014
    What is wrong with my sable when it makes a rattling sound on acceleration?
    120,000 millage
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2007 Mercury Mariner - Engine - 6/20/2014
    Why am I only getting 18-19 mpg with my 2007 mercury mariner hybrid
    I am getting really bad mpg. Runs fine, no engine lights are on. Took it to dealer, no codes are coming up. 70000 miles
     
    0 answer
  • AutoMD Member
    AutoMD Member - 2004 Mercury Sable - Engine - 6/17/2014
    My check engine light is on, car stalls when idle, however it drives perfectly fine at highway speeds.
    Just had service done at the dealership. Replaced the air bypass valve and also the serpentine belt. Still having the same issue as when it was taken in. They also cleaned the throttle body. Had to travel 270 miles to get the car home. 40 miles into the trip ...
     
    0 answer
  • saubstory
    saubstory - 1994 Mercury Villager - Engine - 6/10/2014
    While driving engine sputters?
    Under light or heavy throttle engine sputtered like no fuel then fuel, never has died. Check engine light comes on then.
     
    0 answer
  • Peter
    Peter - 1997 Mercury Grand Marquis - Engine - 6/10/2014
    Fuel pump or throttle body car idles fine but no power when foot feed is pressed.
    I have a ’97 Mercury grand marc. With a 4.6 it has 118,500 miles. I was driving it the a while back and suddenly drop from 65 mph down to about 25-30 mph without changing the foot feed, I limped along for 3-4 miles then it drove fine again for about 5 miles and it ...
     
    • GT500Knights
      6/10/2014 GT500Knights
      Is the check engine light on? Get the codes pulled and research what you find.

      But, based on what you're explaining, it seems to me you may have a large exhaust restriction. Idle will be fine since back pressure is low....but as you open up the throttle, the engine needs to suck in more air to operate correctly. If not enough air can escape out the exhaust, not enough will be able to get in; this causes a substantial rise in back pressure and will retain a large portion of exhaust gasses within the combustion chamber, throwing off the fuel mixture for proper combustion. Places to check for exhaust back pressure would be catalytic converter(s) and muffler.

      Improper fuel pressure can cause this sort of issue, but if the fuel pressure was out of spec then your idle would be affected as well. Now, the volume of fuel not changing would be due to a fuel pressure regulator and/or fuel filter. Not enough volume but high enough pressure is possible. More fuel is needed when the throttle is pressed in.

      Throttle position sensor (TPS) and manifold absolute pressure (MAP) sensors can also cause the problems you're describing. If the computer cannot determine the throttle angle of your foot on the pedal, then it will be unable to compensate for additional fuel needed to be injected. More air will be allowed into the combustion chamber due to throttle plate opening further, but since the computer doesn't know how far the throttle is pressed, fuel injector pulse width will not change. The fuel mixture will go too lean and proper combustion will not occur, resulting in the sputtering and dying. The MAP sensor detects engine load. It determines the difference between barometric pressure and intake manifold pressure/vacuum. Likewise, if the map sensor isn't functioning properly, the computer will be unable to properly calculate engine load and will not adjust fuel injector pulse width, and usually spark advance.
  • Chell Thomas
    Chell Thomas - 2001 Mercury Villager - Engine - 6/4/2014
    Hi...My van drives a little then it dies but cranks back up can some please tell me what this problem may be.
    It was running just fine but after I went on a trip to Miami and came back to Alabama it rode a few day they it just cut off then it wouldn't crank went back at it the next day it cranked but still cut off after a short ride I have changed sparkplugs distributor and ...
     
    • jdl
      6/4/2014 jdl
      Does it stall at idle or highway speed, both? I would give it a tune-up. An intermittent rpm signal can drive you crazy. That signal should come from the crank sensor. The 02 sensor is part of a tune-up. The 02 code should tell you which 02 sensor. With those sensors, I can't rule out a connector or wiring circuit problem.
      jdl
      6/4/2014 Chell Thomas
      Before I bought it it sat up for like 3 years I did nothing to it
      Before taking the trip to Miami and this started a couple days
      After I got back in town. It stats to slows and just cuts off but while its running it runs good then after a good mile or so it cuts off the mechanic wants to replace the knock
      Sensor because he say that's what's came up on his computer
      But I don't want to waste money and that's not the problem
      After 3 years and no tune up before the trip could it really be
      KS
      jdl
      6/5/2014 jdl
      Yes, the knock sensor could cause problems. I realize that isn't the definitive answer you wanted, but, I'm just talking to you over the internet, I can't see a thing from here.

      I understand about money and not wanting to throw parts at it.
      jdl
      6/5/2014 Chell Thomas
      Yes it does stall when you get ready to crank like it don't
      Want to . and it seem like it idle down then shuts off or sometimes
      It catches it self before cutting off
  • AutoMD Member
    AutoMD Member - 2002 Mercury Grand Marquis - Engine - 6/2/2014
    It keeps getting hot
    i changed the thermostat and water pump still does it
     
    0 answer
 
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