I have a 92 f-150 302 and i changed the motor recently which i got out of a 94 f-150. the 94 has the 1-3-7-2-6-5-4-8 with roller lifters and my old motor has the 1-5-4-2-6-3-7-8. Before i put the motor in i put a comp cam, lifters valve springs and headman headers which i soldered on a piece for the o2 sensor. when i try to start the motor it just fires a bit no running. if i put gas in the intake it fires right up i test the fuel pressure on the rail and it seems fine how can i test to see if the injectors are the problem or the signal to the injectors. the 94 truck was sitting for about a year before i put it in my 92.

 

The firing order goes by the cam, so you would have to know the firing order of the cam.
Is the PCM Computer out of the 94 or the 92?
Use a Noid light tester to check to see if the injectors are being grounded (fired).
Is the engine wiring and engine compartment wiring from the 92 or 94?

 

the pcm is out of the 92 i was going to see if i could keep using that one because the 92 has the map sensor only no maf and the 94 truck has a maf sensor so i figured i would have to change the engine comp harness and put the maf sensor in if i ran the 94 pcm. i have tried the 94 pcm and does the exact same thing. Playing with it more today it seems to be slowly starting to fire better i am wondering if the injectors are just plugged up from sitting for that year and half. the engine harness is 94. can i just hook up a 12v light bulb to the injector plug if i dont have a noid light

 

i used a 12v light bulb and hooked it into the injector plugs and 1,2 were flashing but 5,6,7 werent i couldnt get to the other injectors very easily. all injectors i could get to have 12v power on red wire

 

So lets get this straight, you are using the '92 EEC and engine harness right? You don't have any '94 wiring on the motor at all? This is the only way it will work, you can't mix bits and pieces of the two systems because the '92 fires the injectors in batches and the '94 is sequential. The only thing you should have wired to match the '94 are the plug wires.

 

He is using a 94 Engine harness with a 92 engine compartment wiring with a 92 computer.
You will only have maybe two injectors firing that way.

I do not think the 92 engine compartment wiring plug and the 94 Engine harness plug have the same pin-out either.

 

The 94 engine harness should be set up for sequential injection with MAF, so that harness will only fire two injectors with the 92 underhood harness and computer. Swap the 92 engine harness onto the 94 engine and that should allow all 8 injectors to fire.

 

i'll try that thanks

 

my old motor the 92 has a sensor on the intake manifold inbetween 5 and 6 injectors i'm not exactly sure what it is for someone told me it is air temp the 94 motor does not have this sensor not sure what to do

 

Yes that was the air temp sensor, in '94 it was moved to the air box. To be fully compatable with your '92 computer you want this sensor in the intake, it will read quite a bit lower in the airbox (actual ambient temp) so the motor won't reach closed loop. You could drill and tap the '94 lower for the sensor or swap on the '92 lower.

 

Why would the inlet air temp affect closed loop?

 

After changing the engine harness to a 92 motor started right up thanks alot. I installed new lifters, vavlve springs, comp cam with a little bit more lift than stock and headman headers but the motor has little power almost worse than my old motor that had 400 000KM's on it. if i set the timing to 10 degrees it starts and runs no prob but very little power struggles even just to go up a hill but if i advance the timing a bunch it has closer to normal power i've seen out of a 302 but still not great. my check engine light is on and i have a code resder on order but wont be here for a couplw weeks. any thoughts

 

make shure your firing order is correct

 

fireing order good and i changed a sensor now there is no check engine light fuel pressure good and vacuum good

 

Did you remove the spout plug when setting the timing and put it back afterwords?