harezichi

I have a ’99 ford crown victoria and I am having a strange problem
Everytime it is real humid out or I get water under the hood for any
reason the car wont stay on. I will turn tghe key and it will start
but the secon you let the key go it will cut off unless you hold down
the gas. I know it is related to moisture because the car works fine
after it dries up.

thanks for the help!

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tom

your idle air control is bad.

happy traveler

Probably the first thing to suspect is ignition. Assuming that your '99
still uses spark wires (and not the newer coil-on plug system), those are
overdue for replacement. Also, the 4.6L engine has the spark plugs facing
up, which makes the wells susceptible to moisture. I would blow them with
compressed air and apply a thin layer of dielectric grease to the plug and
the seal at the top of the well. While at it, it's probably a good idea to
replace the plugs, even if at much less than the stated 100K miles.

sharon cooke

Replace the COP boots; moisture is getting in there and grounding the
coils. Use silicone dielectric tune-up grease on the insides of the new
boots.