1999 Mercury Villager won't run when warms up

Tiny
MCCSTEVE
  • MEMBER
  • 1999 MERCURY VILLAGER
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 120,000 MILES
When cold it starts up and idles fine. As it warms up it starts missing until at normal temp it stalls out. Will start after an hour or so, Can't seem to go more than a couple miles. Changed the fuel filter and plugs and cleaned uo and check wires. Still no go. I had an ignition module that acted that way once. Any way to check it?
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Tuesday, March 10th, 2009 AT 9:31 AM

7 Replies

Tiny
RACEFAN966
  • EXPERT
Ok yes we can test it. I also need to know what size engine is in it and if you have a digital multi meter. Also is the check engine light on? If so can you get a scanner to use to see what the car is telling us? Get back to me with as much info as you can and we will go from there. Thanks.
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Tuesday, March 10th, 2009 AT 10:19 AM
Tiny
MCCSTEVE
  • MEMBER
Engine light is not on. It is a 3.3L V6.
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Tuesday, March 10th, 2009 AT 10:30 AM
Tiny
MCCSTEVE
  • MEMBER
I have a multi meter unit.
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Tuesday, March 10th, 2009 AT 10:31 AM
Tiny
RACEFAN966
  • EXPERT
Ok I need you to test the coolant temp sensor first. All you need to do is unplug it and check the ohm's across the sensor (not the harness) and do this cold so you can tell me what the abiant air temp is too. Then if that tests ok then we will go to testing the Module. Now if the module is bad it only comes as a whole distributor. You have checked the cap and rotor and ohmed out the plug wires. Any way one thing at a time. Lets test the coolant temp sensor first and go from there.
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Tuesday, March 10th, 2009 AT 10:37 AM
Tiny
MCCSTEVE
  • MEMBER
Sensor measures 4k ohms at approx 40 degrees. Wiring checks our okay.
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Tuesday, March 10th, 2009 AT 1:23 PM
Tiny
MCCSTEVE
  • MEMBER
This morning it started and ran fine while cold. I had reconnected the sensor and the engine light came on. I ran the engine until it was warm and disconnected the sensor. No effect. I turned off the engine and measure for ohms on the sensor; almost zero at about 170 degrees. What's next?
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Wednesday, March 11th, 2009 AT 10:30 AM
Tiny
RACEFAN966
  • EXPERT
Ok that sensor is definetly bad. It should be be .9 ohms at 194 degrees so it is out of range. Now this may not be the total fix but with it bad it is hard to do more tests and be acurate. So replace that sensor and go to your local parts store (one that does a free scan) and scan you car and again write down the codes and then have them clear the codes. While there if you would pick up some mass air flow cleaner and remove and clean the mass air flow unit. Do not use anything other then mass air flow cleaner on it ok. The mass air flow sensor looks like this so this is what you will remove and clean ok.


http://www.2carpros.com/forum/automotive_pictures/249564_396958_1.jpg

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Thursday, March 12th, 2009 AT 10:31 AM

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