Hey guys, my ranger will crank but won’t start. I replaced the crank sensor on it and it started up just fine the first time but the second time it went back to just cranking over. Any ideas what could fix this? It has a brand new alternator, starter, and battery.

 

Do the 50/50 test to see why it won't start

50/50 test
Spray fuel into the engine
Gasoline, ether(quick start), even carb cleaner
Try to start engine
If it starts and then dies your spark and compression are good, but no fuel delivery(fuel pump usually)
If it doesn't start then no spark or no compression
50/50 instant results
(test has been around since 1890's and first gasoline engines, always the first test to do with a crank/no start)
So don't waste your time "thinking" you know what it might be, just do the test and go from there


Watch the CEL(check engine light)
When you turn on the key the CEL should come on, that means the Computer has Booted/Powered up
When you try to start the engine, as soon as the engine starts to spin CEL should go OFF, that means computer IS getting a timing signal from the Crank sensor
(CEL will go off even if you have trouble codes, and it will come back on after startup, if you did)

LISTEN
When you turn on the key the Fuel pump in the gas tank will run for 2 seconds, and EACH key on
Its not quiet, a HUMMMM from behind the cab
Repeat key on and key off as much as you want and LISTEN