Two problems one is the idle varies from 500 to 1200 but the real killer is every now and then (usually when we have had a couple days of heavy rain ) when you start the truck the idle shoots up to 35-4000 rpm and stays . try taping the gas, try messing with the linkage, no change, when the weather dries out it's good again go figure, wouldn't be a big problem but in the winter it rains some every day here
Try changing the throttle position sensor. It varies voltage to change rpm and if it is wet and shorted it will set maximum rpm.
SOURCE: truck starts, dies. truck runs good some days,bad the next
I had the same problem with My 1990 F150 300 6cylinder 4x4.....I cahnged all the same things you did, finally I sprayed a can of Gumout through the throttle body and it worked and ran great. Now I add fuel injector cleaner to the gas and a regular clean with the gumout and the problem has'nt come back. Good Luck to you and hope it works!
SOURCE: 1992 ford aerostar van wont start after it rains
I just had this exact problem. Wouldn't start or took 15 trys to start, but then ran smoothly. Sometimes a little rough starting on dry days, but pretty much hard starting after rain. I was thinking water in my tank/bad gas, but shooting some starter fluid in my intake didn't give me the initial blast at start up... that certainly indicated that it was electrical...
...but the next day the vehicle stalled in the middle lane of a three lane street, wouldn't restart. After pushing it to the curb, I got to the point where I was checking the wire from the coil to the distributor cap. Two thirds of the wire lifted right out. This wire was in 2 pieces! Amazing that it had been running at all, with this one wire burned down to a whisper, before it broke completely. There were signs of heat/elec damage to the wire also at a point an inch away on this wire.
Replacing the wires is absolutely the first thing to try. It's cheap and easy to do, and it should be done (or the wires inspected/tested) routinely anyway. The coil-to-distributor coil gets more engine heat and more use than any of the indiv spark plug wires and hence wears much faster.
I am betting this wire is much more likely your problem than a coil failure. Good Luck!
SOURCE: evaporator drain problem after a heavy rain...
it is located on the right side of the vehicle very close to the firewall, it is easiest to look under the truck or underhood of the truck lower right side of firewall for a rubber tube about 1-2 inches long, find the tube and squeeze it, dirt wasps like to build nests in there, if crud runs out it should run water when a/c is on, if it is dripping with a/c on it may not be clogged, but look anyway
SOURCE: 2000 Ford Windstar, won't start after heavy rains
well i would start buy geting the rain water of the top of motor so i would start at hood seal if bad but new hood seal in you may have to go to dealer for it then if the spash gard is missing under car i would replace it with new one then see if car hard to start next time it rain should have no water at top of motor can couse all typ of isuse hope this helps
SOURCE: Car will start but will not stay running-not getting gas?
have fuel injection system cleaned
Testimonial: "Thank you for the quick reply. This was one of my first thoughts along with possibility of a blocked fuel filter, fuel pump, or plugs/coil connectors."
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