Having problems with your 2002 Ford Explorer Sport Trac ?

2002 ford explorer sport won't start in weather under 32 degrees the colder it gets the harder it starts. Its not the battery, it has recently been replaced. Some days will start after many attempts, some days it wont.

Posted / edited by AnonymousUser on : 03-08-2020

Answers :

This sounds like a signal for the cold start routine is not reaching the brain. Your SUV uses water temperature to tell the brain the engine is cold. There are 2 sensors for the water, one for the gauge and one for the computer.
\012The signal makes the fuel mix rich and speeds up the idle. It works like a choke. Go to Autozone or Oreillys and get a free scan. You should ask about a starter draw test too. When they scan your SUV they can show you where the sensor you need is located. Just change it and the next cold start will be either good or still bad.
\012If the start is still bad you have to look for other reasons. The fuel pressure is one thing to measure and this will require a pressure gauge. Check the Intake manifold for vacuum leaks after the engine is running with a water spray bottle on the seams of the part. A leak will affect the RPM. The colder weather can cause a marginal leak into a bigger problem making leak. Then when the engine does run, the heat expands all the parts and the motor runs great. But cold it does not draw the fuel in properly and starts poorly.
\012Hopefully your problem will be solved with my first solution. Would be interested in what you found.
Repair Help & Product Troubleshooting for 2002 Ford Explorer Sport Trac

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