my girlfriend had a 99 f150 she will turn the ket to start her truck and the truck will crank crank and crank but wont start.... i would turn the key back and forth really fast like 8 times then the truck will start right up.... so i switched out the ignition box on the steering column and it worked for couple days then back to not starting. NO enging codes no nothing what the hell could it be any one have any idear or have ever had this problem please help!

 

Sounds like a weak fuel pump. Run a pressure diagnostic on it. If you don't have a fuel pressure gauge, - Auto zone has that free loner program.

BTW- Change the filter first.

 

You need to post engine size as well. It matters.

 

Isn't 99 PATS? Try the other key. The transceiver in the steering column may have an issue.

 

its a 4.6

 

ill check the fuel pressure and the pats was my next step but does the clock spring and pats go together or can u just change the pats black ring with the matching key and it work fine???

 

Yea , I think the theft light will blink continuously if the PATS are screwed up.

Turning the ignition on and off that could be the only way it's building enough pressure at the rail.

1. You should be able to hear the pump charge the line in the run position every time.

2. It may not be able to w/filter plugged, bad pump, bad relay.

 

the filter is less then a year old hope the pump is not going haha wheres the relay

 

They changed locations in 99, so I'm not sure where they put them. There should be a an owners manual in the glove box. That has the location.

Turn the key to run and feel the relay, - if hot, it's bad. You might be able to swap that relay with the horn relay. They should be the same.

If you don't have an owners manual, - download one @ motorcraft .com.

 

If it's the same as my 03, it's relay #301 in the underhood power distribution box. Your owner's manual will confirm. If you don't have the manual you can download a PDF from Ford fleet services - just Google "ford owners manual".

 

Yea, - 98's are here, under the hood, but I'm pretty sure they moved them for 99.

 

sweet ill fimd the fuel pump relay n check it

 

no hot relay and it wouldent start 3 times then i did the key **** and it started right up! this is so weird

 

so i did find that fuse 10 fuel pump needs a 20amp and it had a 7.5 amp.
fuse 18 is PCM injectors fuel pump MAFS had a 5 amp witch needs a 15 amp so wondering if the power suply was not 100% so caused it to fail. sounds like it could me a reason???

 

i don't think its your fuses if they couldnt handle the current they would blow however you do need the right fuses in there lol. does it run good when you do start it after a good drive? if it does i doubt its your fuel pump. does it have after market battery connecters on it ? if so make sure its the light strap type connecter with the set screw. i posted a thread about this and some people left some interesting posts on the subject.turn your key to the run position not start position you should hear the pump humm every time for 1-2 secounds thats the fuel pump primeing if you dont hear the pump have someone hold there hand on the relays under the hood and turn the key to the run position they should feel the relays click under there hand. if not try swapping the relays and try again. if you do hear the pump in the run position turn it run and off letting it prime each time 4 or 5 times and see if it starts then if it does then you have fuel pressure problem at the pump or regulator. im by no means an expert just my 2 cents worth hope this helps and good luck.