Hi i have a 98 f150 4x4 4.6 triton and i have been having some problems first thing is my truck has been running bad for a while sputtering and hesitating during acceleration and go up hills just yesterday i got dual flowmasters put on without cats and by the way they sound pretty awesome but later on that day on my way home i was just driving normal everything seemed fine and all of a sudden my truck died going down the road i pulled off it wouldnt start back i done a quick checkup on it checked fuses and everything else and decided my fuel pump may have went out so i got it towed home put a new fuel pump in this morning and the truck still wont start it turns over normal but wont fire up went over everything i could think of and still clueless i found that my coils had no fire coming from them i have two on my truck and neither one fires they have juice going to them but thats it i just think its kinda odd that both fail on u at the same time i also checked my old fuel pump by hooking some wires to it and it was ok so i really didnt need a new one i just cant figure out what in the hell happened to my truck its like my fuel pump isnt getting any fire to it i switched my fuel pump relay with another relay and nothing happend so just figured the relay was ok im clueless on what to do i would really appreciate any help

 

Check the connection at the HDR sensor mounted to the front cover just below and behind the A/C compressor. Other than a fuse ( double check them again) or the PCM check all the harness connections as well.

 

what about crank shaft position sensor could that have something to do with it thanks for the reply i will check it out

 

i fixed the problem put a new crank shaft position sensor on and it still wouldnt start but then i checked my fuses again and my pcm 30 amp fuse was blown i replaced it and my truck fired up but i know i checked that fuse the day before so the sensor may have fixed the problem and i just blew the fuse doing something else i dont know but she runs now

 

It takes quite a bit to pop a 30A fuse, you generally know when You've popped one. Also, do you have an owners manual? 30A seems high for that fuse. Does it actually call for a 30A fuse? How long have you had the truck? Is there a chance someone else might have put a 30A fuse in because a 20A was blowing? Don't know what they were using in '98 but it still seems high for the PCM. What else is on that fuse? Is there a chance that is blowing it? I'm still wondering if either the pump OR CSPS were actually bad. Still have the feeling there is an underlying problem there.