jclark

i know this is a f150 fourm but i have a 4.6 expedition its a 2000. after it rains or has been humid the expy doesnt have any power. and it will gain its power back when i push the pedal to the floor. there is a check engine light on but the mechanic wasnt able to read the code. so he cleared it and it came back on. what do you think on this.

JChambers

gota figure out that code first. Then u can go from there.

eab9109

1997 ford f-150, moisture on #4 plug replaced wires went away, check boot for cracks or apply di-electric grease to boot before reinstalling, see if that helps

willycavs10

yeah its coil packs, 3 of mine were bad and my plugs were ancient. 1 of my cylinders wasnt even firing, it was just pumping gas into my cats hahaha have the dealer run a check on the packs

jclark

I finally got the codes read p0161 and po401. po161 o2 sensor heater circuit malfunction. po401 exhaust gas recirculation flow insufficient