Hi:
I'm at the end of my knowledge and my truck still death.
after sudden stop, truck die. First was a short caused by the coil, every time you turn the key to the on position the fuse # 19 blew. After changing the coil I was able to turn the key without a burnt fuse. Got spark at all spark plugs, gas pressure is 55, changed crankshaft and camshaft sensors, changed timing chain.
what is the next step?
1999 ford ranger 3.0 V6 Flexfuel 4x2
Any help would be appreciated!!
thanks

 

Welcome to the forum

Fuse #19(25amp) is the PCM Relay Load power, it supplies 12volts to the coil, but also to the computer, fuel injectors and PATS(passive anti-theft system)

Since you don't mention it I assume the starter motor is turning the engine over when key is turned to START.

I would then do a 50/50 test
Remove the large air tube from the upper intake, open throttle manually and spray some gasoline or Quick Start(ether) into the intake.
You can leave the air tube off for the test, make sure it won't hit fan blades
Try to start the engine
If engine starts and then dies, you have spark but no fuel injectors
If engine doesn't start then you have no spark
50/50

Testing for spark doesn't mean you have spark at the right time, 50/50 test tells you

A coil pack has .6 ohms which is pretty much a dead short, I am surprised it would blow the PCM Fuse.

After cranking the engine a few times pull out a spark plug, it's tip should be WET with fuel, if not then injectors are not working.

Computer(PCM) opens the injectors based on RPMs from Crank(CKP) sensor, and spark is also timed using Crank sensor
So it you have spark the CKP sensor is OK.

Failed 3.0l Cam(CPS) sensor can cause no start, in the late '90's Ford changed from a 3 wire CPS to a 2 wire CPS, these are not interchangeable, PCM is setup to read only one type of signal from a CPS, either 3 wire or 2 wire, you can't "rewire" to get a 3 or 2 wire to work on opposite systems

Since you have fuel pressure I will assume the fuel pump is coming on so the PATS anti-theft light is not flashing rapidly when key is turned on.
PATS disables fuel pump and fuel injectors if wrong key is used

 

Hi
Thanks for the reply
after doing the 50/50 test no luck, engine turning but not starting, spark plug dry after few cranks
could be the com?

 

Mean pcm

 

Does the CEL(check engine light) come on when you turn on the key?

That means PCM is powering up

I know it is a pain but pull out every fuse in the engine fuse box, one at a time and test with OHM meter, or very GOOD visual inspection.
Also pull out every Relay look for corrosion on pins, one at a time and reinsert it if clean

PCMs don't fail very often, not never but not very common.

On 1999 Ranger the PCM connector can get water inside, connector is on the firewall(engine side) near the top center but toward passenger side.
UNHOOK THE BATTERY!!!!
And remove the connector, check it for corrosion

 

Done, even check ,change and interchanged relays to rule out that possibility.
Don't know what else to do,
motor seems to turn fine, when tries to start you can feel and hear the motor having trouble to start like when a car is out of timing, that is why I was wondering about the COM
Any thoughts?

 

So CEL comes on with the key?

If engine doesn't fire/start up after adding fuel manually to intake then you have no spark or no compression
Dry spark plugs also means no fuel

I think the 3.0l had a larger wiring connector on driver side of engine, you could check that for water intrusion, spark and injector control passes thru it.

You could try compression test but it would have to be very low, under 100psi, to cause a no fire at all, and if you used Quick Start(ether) with the 50/50 test then it should fire even with low compression, ether has lower flash point than gasoline, which is why it is used as "Quick Start", lol.

And you are getting down to a PCM problem.
It is well out of warranty so you can pull it out and open the top to see what circuit board looks like, dark discolored areas would indicate problems.

This is a picture of the EEC-IV computer: Ford EEC-IV
You have newer version, EEC-V, but circuit board should look clean like this