Having problems with your 2004 Mercury Mountaineer ?

Won't start when cold

\015 Must press on accelerator to start\015 Posted / edited by AnonymousUser on : 12-04-2021

Answers :

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.

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Repair Help & Product Troubleshooting for 2004 Mercury Mountaineer

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