Question about 2001 Ford Expedition

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Every time it gets wet under the hood of my 01 ford expedition 4.6 lt. the engine begins to miss so bad that I have to hold it to the floor to make it move last time I changed all the plugs and the coils and blew out each port,it was good for about 6 months, now out of the blue its doing it again,whats going on!!!

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Your questions can not be answered without the vehicle and it's past history and past repairs etc.
Most times weather conditions are just a coincidence.
Most COP Coil Fords, have at least one bad coil.
Plugs very seldom fail,and unlike most recommendations, I personnally only diagnose one issue at a time,and replace only the one or two failing coils. That said, you need to have the knowledge and test equipment to do so.
If you have no MIL Lamp on and no stored codes, a coil still could be going bad
A partially plugged fuel filter or converter,could effect your power output.
Also any vacuum leaks in the ducting to the Throttle Body or any vacuum leaks,upset the MAF Sensor and Fuel Stratagy.
Less likely, a lazy O2 Sensor .
I would check the TPS Sensor,Key-On-Eng-Off,for voltage output.
Also grounds and Alt Output, as well as AC Ripple out of it.
Your Fuel Pump may work, but not give you the volume you need.
What you say is getting wet, may play a roll,if it is dripping rain onto and into the coil wells.

Posted on Aug 27, 2010

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