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1992 Fd single turbo with power FC. The issue that I keep running into it seems, is the car almost immediatly floods everytime i go to start. I rebuilt the motor a while back because it was having issues and wanted to refresh the motor. Ever since, it has been crank no starting, But with fresh plugs and a completely dry motor, it will fire or combust maybe 3 or 4 times before it completely floods within seconds, fouling the plugs and after that it just cranks with nothing. That is always the very first startup attempt with fresh plugs. I have played with injector timing dropping it very low in hopes of leaning it out but it continues to flood and im running a tune that worked before the rebuild, so I shouldnt have any problems there. The compression read good and i have traced the entire ignition system ensuring there is strong and consistent spark. It doesnt seem like the injectors are leaking as i have left the ignition on and made sure there is nothing leaking into the combustion chambers. I tested the injectors before the rebuild because I was chasing a different issue and the primaries seem to be firing correctly and consistently. I feel like im missing something and im not sure where to go from here. There may have been things I forgot to incude but i will update if I remember.
verify your map sensor vacuum line is hooked up to the correct location and DOUBLE verify that when it fires youre actually getting a vacuum reading on the commander
Like FD Auto said, check the MAP sensor vacuum line. I left that unplugged and the car started horribly. Also, good call on the vacuum reading on the Commander.
Also, I'm not sure with the Power FC, but I had to reset the stock ECU after I did a fuel pressure check on the rails. The stock ECU threw a bunch of codes because none of the other sensors were hooked up when checking fuel pressure, and after assembling everything, the car ran horribly. It turned out I had to disconnect the battery again so the ECU could detect all the connections. After that, it ran great.
Ok so i drained the gas (which was in terrible condition) and I watched the vaccum pressure as i attemtped to start it and the was no change in the reading at all so i believe the MAP sensor ieither isnt hooked up correctly or has failed. The only way i could find to measure the MAP sensor was to watch "BOOST" pressure in the commander, is this the correct way to measure?
Yes, boost is what you would be watching. You won't necessarily have a vacuum reading while cranking especially if you don't have the correct calibration settings. You need to watch it while it's running. You said it starts briefly before dying out. You only need it on for a second or 2 to see the reading change.
Post a picture of WHERE the vacuum line for the map sensor is hooked up.
From experience, that location does not work for the map sensor. Put it on the factory location
You mean it needs to be pre-throttle not post-throttle? Unless I'm misremembering the layout of the upper manifold.
I think maybe you should pull the fuel fuse and give it some starter fluid to see whether you're actually getting good spark. If you're getting partial combustion, then you're getting some fuel and some spark, but possibly the wrong amount or timing.
Who installed the engine?
Double check that the engine ground is clean and tight.
Pre throttle only sees atmospheric or positive pressure. Vacuum only exist post throttle. I don't know what's wrong with that port but it doesn't work for map reference. According to what it was doing on the haltech it was as if it was delayed by ~1 second with any change. Lag is the best way to describe it. A lot of it. Moved it to the factory location and map reference moved in real time.
the description of events here sounds like a bad map reference. There could be other things contributing but thats what jumps out at me
