Ithought My problem was the ecm, so I replaced it. the truck will not start, can someone please point me at a possible problem, or give me an idea of where to look for a problem. all help is greatly appreciated, thank you.....1992 f150 4x4 5.8

 

Have you checked for spark?
Have you checked the fuel pressure?
What made you think the EEC Computer was bad?
Do you hear the fuel pumps run for one second a quit when you just turn the key on?

 

when I took the ecm top off, it had like sand around the bottom of 3 capacitors, so I was assuming they were leaking, I did check for voltage at the coil and it had 12v with the key on. the fuelpumps are running for a few seconds when the key is on than they stop like they normally due and its getting fuel pressure, the truck was idling up and down than eventually wouldnt start, is the reason i thought the ecm was bad. also I just unplugged the map sensor and it tried to start which is more than it was doing

 

Is the vacuum line hooked up OK to the MAP sensor?
Have you ran a self-test to see if it had any hard codes?

 

Started haveing problems with engine surging and not wanting to idle at all, and eventually would not start at all, so I took out the ecm and it looked like a few of the capacitors were leaking, so I replaced the ecm and also replaced the map sensor, since it was the only sensor that couldn't be tested without special tools and it was probably an original part,but I still cant get this truck to kick over, it cranks fine and is getting fuel pressure at the rail and 12v at the coil, it almost wants to start but doesnt, the truck has been sitting about 4 months b4 I had the money to buy the ecm and map sensor with about an eighth of a tank of gas, I have tried spraying starting fluid in the tb, but nothing different, I hooked the code reader up and got a 111 code with the koeo, I checked for vacuum leaks in the hoses and found none, I have had the tb off several times (without replacing any gaskets) could the gaskets be leaking and causing the no start,? I am 50 miles from any part store and without transportation to get there, so I am trying to figure this thing out.I did take the iac valve off the tb and cleaned it,,but if i hook the wiring harness to it while it is off and turn the key on, it doesn't seem to be working, shouldnt it click at least? Any and all help and suggestions are so greatly appreciated
1992 f150 4x4 5.8

 

Did you hear the fuel pump come on during the self-test?
I do not think a vacuum leak at TB or the map sensor would keep it from starting.

 

yes the pumps ran for a second when i did the self test

 

can any othe sensors cause the no start, 02 sensor, iac, they are probably original too

 

No I do not think so. The O2 sensor is not even looked at until it starts.
You can bypass the iac by opening the throttle with your foot.

 

The only sensors in use during crank and start are the RPM (PIP) and ECT.

 

wow, b4 I changed the ecm, I did swap the ect sensor with a used old one that I already had thinking it may be bad,,hmm Now you got me wondering if the ect is bad, would a bad ect sensor cause a no start?
maybe the one i swapped with is bad??

 

If the engine is cold and the ect sensor says it is hot then the fuel mixture may be too rich to start. But if you hold it to the floor after a rev or two it should then start.

The RPM (PIP) sensor can be checked by checking for spark, if you have good blue spark the PIP should be good also.

If you have good spark then check the fuel pressure (about 40 PSI) if it is under 30 PSI it may not start either.

If you have good spark and fuel pressure and no codes then check your timing and compression.

 

ok. I have 12v at the coil wire post that goes to the center of the dist. but I just took a plug wire off and connected a new plug to it and I am not getting any spark

 

I am not sure what you said there.
I take it you have 12v at the small wire going in to the coil. If so check the other small wire while cranking the engine, it should flash your test light.
Also this plug has been known to cause problems. Make sure both small wires are good going into the plug and plug is making good contact.
You should also have steady power on both small wires while not cranking with the key on.

 

I am sorry i didnt make it a little more clear,,,, I was talking about the main coilwire post where the sparkplug wire looking plug goes to, I only checked the voltage there and it had 12v with the key on, also I just pulled the plugs and they are all wet with gas