Question about 2004 Mercury Mountaineer

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Won't start when cold

Must press on accelerator to start

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Most likely your Temperature sensor for the "Cold start routine" is not sending the signal to the Master computer. There are usually 2 sensors and one operates the dash indicators while the other tells the controls that the engine is cold.

This enrichens the fuelmix and adjusts timing to provide a rich run condition for the engine. It will operate for only a few minutes, then reset to warm engine conditions. You will need to locate the correct sensor and try changing it. Sometimes less Antifreeze will be lost if you work on a cold engine when removing this part.

Another remote possibility is the TPS switch on the throttle. This switch may have a bad spot on the "at rest" position and fail to provide a signal for the engine. It would be a bit rare to not set a code, usually this part is something that either works or does not, but check the mounts. They rarely slip, but if one did slip it can be your low end problem.

Please rate my info.

Posted on Jan 03, 2013

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