2.5L ('98-'01) 99 2.5 Starting issues

[Theunknownstep123]

Hello, I’ve got a 99 2.5 manual ranger xlt with 170k miles. I’m currently having a no start issue with the truck and I am thinking it is the PCM. It cranks over but has not started. I have recently obtained this truck, it has not run in 5+ years.

I have done the following testing:
-Confirmed timing belt and marks line up
-Receiving spark
-I am getting fuel pressure/pump is working
-Replaced relays
-Checked all of the fuses under hood and in cab
-Looked over all grounds
-Confirmed getting 12v+ at battery
-Checked Inertia switch
-Drained all bad gas and put fresh gas in tank and confirmed it has made it up to fuel rail
-Sprayed starting fluid and tried cranking, does not start. Putters a bit more than regular crank no start but wouldn’t call it close to running.
-When key in and on position there is no check engine light lighting up, all other dash lights are on
Am I missing other tests I should try? I think I’ve listed everything I’ve done. Any advice before ordering a new computer would be appreciated

 

[SenorNoob]

If you have spark, and fuel to the rail, what about fuel to the cylinder? Or air/compression? If all those check out then it would have to be timing.

 

[sgtsandman]

Since the engine sputters when you spray starting fluid, that indicates a fuel problem and being that you confirmed fuel is getting to the rail, the injectors are the thing to look at.

The fuel injectors could be gummed up and clogged because of the old gas. If you have the ability, try removing them and cleaning them. Otherwise, you are looking at new injectors.

The other thing to check in order to make sure its not a PCM problem, is to check if the injectors are getting power. I think, but I'm not sure (verify this), that the proper voltage is 5 volts. If power is good, that heads you back to clogged and gummed up injectors.

 

[SenorNoob]

Injector power (on older vehicles anyway) is usually 12v from a relay. The PCM just connects ground to fire them. A meter would probably show something like 5v when running due to high frequency of the pulses.

Now I wonder if an led 194 bulb would work as a noid light?