I had a fi 351w that did the same thing and it was the computer temp sensor.easy to check with one from the junk yard, free or real cheap.Not sayin it's what your prob. is but it is what mine was.
started to but ran out of daylight,no shop at home.friend of mine thats a tech thinks it burnt the quad driver in the computer.i dont want to spend $500 that i dont have with out knowing thats it.told i cant put a wrecking yard one in it because there flash programed to the vin.but i dont know...
Started missing found inj. wires rubbed through and touching.Have fixed the wires but can not get a pulse.have low constant voltage just enough for a test light but no flash.any idea's would be great dont want to take it to a shop or start throwing parts at it.:wtf: HELP!!!!!!!!!!!!!!!!!