I've got a 1997 f150 6 cyl with 167,000 miles that started cutting out, then wouldn't start. I checked the fuel pump (wasn't working), so i put a new fuel pump and fuel filter and the pickup started and ran good, but after i turned it off it won't start again!
I don't have a diagnostic tester , but I've checked the fuses and fuel shut off switch. What do i need to check now? Would the crank sensor make it do this? Thank you in advance for any help you can give me!!
Answer: Yes, a crank sensor can give the problem you are having with your Ford. It could also be many other things. You need to narrow it down to what is missing- spark, fuel pressure, or fuel injector pulse signal.
When your truck is not starting, check fuel pressure with a gauge. If there is none, you may have a bad connection at the fuel pump or the pump relay is bad.
If pressure is good, pull off one of the spark plug wires, crank the engine and see if spark is jumping out of it. If not, i would look at a bad ignition coil or module.
You would also need to check for fuel injector pulse. If no spark or ignition, then look at the crank sensor. If you DO have spark but not injector pulse, then you may have a bad computer since that is what controls the injectors.