Question about 1999 Mercury Cougar

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99 mercury cougar idles rough and stalls on acceleration.

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  • dave3369 Apr 17, 2014

    witch engine, auto or manual trans, how long has it been since plugs,fuel,air filter etc?

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  • 13 Answers

Possibly TPS sensor located on top of engine or leaking vacuum line

Posted on Apr 17, 2014

  • angel_wings5
    angel_wings5 Apr 18, 2014

    check spark plugs and wires first, then try the ignition coil. crankshaft sensor. i had the same problem with mine and all of this was the cause of the problem. Good Luck :)

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6 Suggested Answers

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Posted on Jan 02, 2017

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motor1258
  • 6674 Answers

SOURCE: Car won't start after it rains

Sounds like it might be time for new plug wires & cap.

Posted on May 09, 2009

chuck943
  • 783 Answers

SOURCE: vehicle speed sensor

You will have to get to it probably from under the car it will be located just to the right of the driver's side axle

Posted on Feb 01, 2009

  • 1 Answer

SOURCE: o2 sensors on a 99 mercury cougar v6

I just got done replacing the O2 sensors in my 99 Cougar due to throwing a P0135 malfunction code. There's 3. Facing the engine there's one in the front coming off of the front header, which is easy to get to. Another more tricky one if between the engine and the fire wall on the rear header pipe. The third is under the vehicle behind the transmission pan on top of the exhaust. In order to replace the O2 sensor near the fire wall you will need to remove the 4 retaining bolts for the ECM module and move it out of the way. Additionally you will need to remove the 2 retaining nuts for a wiring harness that is seated below the ECM module. Pay close attention to the connectors because the front and under vehicle O2 sensors have round connectors the one near the firewall has a squared connector. I was able to replace all 3 by myself in approximately 35 minutes. If your throwing a O2 heater malfunction code it is most likely going to be the sensor near the firewall. make sure that you know someone with a code reader so the code can be cleared. If you're do for an emmissions inspection be sure to put at least 40 miles on the new O2 sensor with different types of driving (e.g. highway, coasting, decellerated turns and rapid acceleration). Gotta love project cars for your kids!!

Posted on Apr 04, 2009

  • 14036 Answers

SOURCE: High engine idle 94 Mercury Cougar

replace throttle body gasket. first check to see if carbon has built up around the throttle valves in throttle body if so remove and clean it with throttle body cleaner.and a old tooth brush. besure to remove all electrical components or any thing that plastic or rubber the cleaner will destroy it.

Posted on May 18, 2009

  • 1 Answer

SOURCE: MY 99 MERCURY COUGAR WILL NOT TURN OVER . I

its pats

Posted on Mar 28, 2010

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