Check it with them hooked up and ignition on. The three wires are, one ground(pcm), supply voltage(5. volt) and the return wire to the pcm. The return wire should have varying voltages you turn the tps. I believe it starts out near the 5 volt range and goes down as you move the throttle. The return wire is the center one on the plug. If you still see a constant .5 volts with a good tps then i would look for another pcm.

 

Less than one volt at idle, greater than 3.5 volts at WOT.

 

It's probably the asd(auto shut down) relay. The pcm sees no return voltage(or voltage when you hooked it up) and is turning it off/on. Do your tests with with everything hooked up.

 

Sounds right, Forgot witch way it worked.

 

TPS voltage is good, even checked at the PCM to make sure, map voltage changes once it starts, so that's likely good as well. I checked the oil and it's at least 1l overfilled although I only put in 4.5l when I changed it a month ago. It smells like fuel as well. I'm back to thinking I have bad gas, although I have added 20l of fresh gas I know that water is heavier than fuel so it would be at the bottom so the new gas would be irrelevant.
I have good power and ground at the PCM, key dance shows no codes after running. I checked injector pulse with a test light and it seems fine. I'm gonna get a fuel sample tomorrow and see if it's any good and go from there.

 

Fuel in the oil implies you are running pig-rich. Check coolant temp sensor.

 

Yep, checked and replaced. It was visibly damaged (once I found that little bugger, lol) so I replcaed it, no difference. Maybe I'll check continuity of those wires to the PCM.
The truck does sit a lot, and never has a full tank, so that's why I'm thinking maybe water in the fuel, or just bad, old fuel.

 

Could check fuel at the rail.... disconnect the fuel line, stick it a jug, turn the key on to pump some fuel, pour that into a glass jar, and let it sit for a bit.....

 

Ya, got very limited tools at home though, took a thin piece of wood and hit the scraper valve with it to get it wet with fuel, took a lighter to the stick after and it lit up and burned for a few seconds...doesn't prove much since I already know it runs on it, just gotta see how good it is. Gone play tomorrow, will keep you updated.

 

K, update time.
Brought home a drb3 and cable(just found it) so I could check live data, all sensors are in line except 02 is stuck at 5v, I'm sure this is irrelevant since it isn't used in open loop anyway. Coolant temp is 50, iat is 50, TPS is in line, map changes voltage when vacuum applied or running BUT I do not see a change in map vacuum on the scanner. This is weird since the map only has one signal wire so the PCM must figure out the vacuum by the voltage.
Anyways, I stuck a used PCM in anyway, no change. Fuel is good, have 25kv of spark at the wires, 35kv at the coil wire. Gonna change cap and rotor tomorrow but 25k is more than enough to run and run well.
Still the same issue though, too much fuel or being injected too late. Checked injector pulse and it's good, pressure is around 40psi. Timing marks all line up, checked two cylinders for compression and they have 150. Can see cam and crank sensors on the scanner and they show good. I'm still lost though, this can't be is hard, lol.