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4.0 won't start help
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Joined: Sep 2022
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From: Colorado Springs
4.0 won't start help
Ok hello I am new here so beat with me thanks ! My problem is I was driving my truck and it seemed to die but it still was idling so I was close to the house I coasted home still idling but I put my foot on the pedal and it would die out take it off and it would idle ? So I put my code reader on it it said detected misfires and IAC was bad ? I change plugs and wires and got a brand new IAC put it on , now she cranks but won't start ?? I apologize I have a 1996 ford ranger xlt ex cab 5 speed tranny two wheel drive . I am in need of help the truck is the way I make a living , so if someone could help me I want to thank you
Welcome to the forum
+1 on the bad IAC Valve code, no OBD codes can ID a bad part, just bad signals or intermittent signals
In any case it reads like you were losing fuel pressure, dirty fuel filter maybe
And could have a leak in brake power booster, but not why it won't start now
Do 50/50 test
Spray fuel into the engine, gasoline, quick start(ether), carb cleaner, ect...............
Try to start
If it starts, runs and dies, then you have good spark but no fuel flow from injectors
If it doesn't start then you have no spark
50/50 instant results on what to check next, no guessing
When you first turn on the key you will HEAR the fuel pump run for 2 seconds and then shut off, its not quiet
Repeat key off and then on as much as you like to HEAR if fuel pump is working
When you turn on the key the CEL(check engine light) will come on, that means computer has Booted Up
When engine starts to turn, cranking, the CEL should go OFF, that means computer is getting a good timing signal from Crank Sensor so will start spark and then open fuel injectors
You can also crank engine over a few times then pull out ANY spark plug, its tip should be WET with fuel, if its DRY then no fuel is making it into the engine
It spark plug tip is WET, light it with a match or lighter, should burn easily, if not there is NOT gasoline in your tank, its something else, if you just got gas prior to this then you got some "bad" gas, has water in it, it happens
Engine would misfire, and barely run, and would not restart once it was cold, so could fit your description
+1 on the bad IAC Valve code, no OBD codes can ID a bad part, just bad signals or intermittent signals
In any case it reads like you were losing fuel pressure, dirty fuel filter maybe
And could have a leak in brake power booster, but not why it won't start now
Do 50/50 test
Spray fuel into the engine, gasoline, quick start(ether), carb cleaner, ect...............
Try to start
If it starts, runs and dies, then you have good spark but no fuel flow from injectors
If it doesn't start then you have no spark
50/50 instant results on what to check next, no guessing
When you first turn on the key you will HEAR the fuel pump run for 2 seconds and then shut off, its not quiet
Repeat key off and then on as much as you like to HEAR if fuel pump is working
When you turn on the key the CEL(check engine light) will come on, that means computer has Booted Up
When engine starts to turn, cranking, the CEL should go OFF, that means computer is getting a good timing signal from Crank Sensor so will start spark and then open fuel injectors
You can also crank engine over a few times then pull out ANY spark plug, its tip should be WET with fuel, if its DRY then no fuel is making it into the engine
It spark plug tip is WET, light it with a match or lighter, should burn easily, if not there is NOT gasoline in your tank, its something else, if you just got gas prior to this then you got some "bad" gas, has water in it, it happens
Engine would misfire, and barely run, and would not restart once it was cold, so could fit your description
Last edited by RonD; Sep 6, 2022 at 12:59 PM.
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