Question about 2001 Ford Explorer Sport

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2001 Ford Explorer won't start!

My Ford Explorer, which I purchased used with 73,000 mi last Dec.has been running o.k. til this week. When I try to start it,she won't start unless I hold the gas pedal down. As soon as I let off she shuts off. What might this be?

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This vehicle does not rely on anything but computer timing and fuel to stay running. With that in mind the computer relys on many sensors to judge the proper fuel mixture to keep the car running. The first place to look is the fuel system. If the pressure is low it may be the fuel pump or a blocked fuel filter. If the pressure is correct you would move on to checking the injectors. If all if right with the world on those two it becomes a bit harder. The engine timing relies on quite a few sensors, there is a sensor that replaces the distributor it can slip if the screw is loose and cause timing issues, there is the O2 sensors which from a cold start should hold the voltage high telling the car to provide fuel, it they hold the voltage short then the car will not provide enough fuel to keep the engine running.

You would need a tool to read the engine diagnostics, when you first start the truck the engine should report that it is in "open loop", and switch to "closed loop" when the O2 sensors reach the 600F operating temp that they need. If this does not happen check the sensors. If your tool does streams you can also pull a chart of the O2 output, at cold start it should be a straight line at the top of the chart, and switch to a sine wave with the average of the wave being zero once the system goes into closed loop.

Posted on Jul 14, 2008

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