I am trying to finish up a car that is killing me. I have gone through and tested everything on this car. Start By telling what im working on and PRAY someone out there can point me in the right direction
CAR, 93 rx7
ENG 13b RE
TURBO, Howard coleman Twin Garrett setup
Harness, Rywire single turbo simple setup
ECU, Apexi Power FC with commander, Datta logger
Safe mods, FPR gauge, Wideban, & boost

So I Have No spark with power FC when cranking, Crank angle sensors NE + G are in the right spot, Harness cont good from sensor to ECU, Sensors tested Good, (OHM test) Have power to the coils, OHMs on high tension leads good, Coils test good (even swaped with known good set) Igniter Good (also swaped with known good) Tested Ignition switch, Did wire / pinout on harness to ECU all good, Took ECU cover off nothing burned, Swapped with different PFC same problem, Now if I put in a stock ECU, I have to run direct power to fuel pump but fires right up..
SOMEONE HELP ME KILL THE DEMON iM not on forum often but will be for a minute Please help or email answer direct or PM

 

I think I know..I "heard of this".
So I will give you my take on it.
Your Power to the Ecu is being taken off a spot that will give you 12 volts with KEY ON.
BUT when you turn the Key to START,it takes that power and shuts it down to allow the starter to get juice.
Just like when you go to start your car you can't hear the stereo for a second.

Try an Alternative 12 volt switched wire,that gets power at START too.

If you would like to "test this theory",then just put 12 volts to the power side of the ECU( Instead of switched) and attempt a start up.
Strictly a guess here,but it does sound like that is what is happening..right?

 

Checking that again now, I checked at harness but I am going to direct route. Thanks.

 

I am curious so post up either way.

 

that did not work (it's my car)

Sometimes it will fire with the PFC and then 2 min later we try to start it and have no spark or very weak spark. We have tried swapping to another PFC, no change.

Any other options we could try? rx72relax and I could really use the help.

 

Also could we get this moved the main tech section? so it gets more views?

 

when my PFC showed no crank angle i had the wires backwards, as i had broken connector i tried 4 different configurations before the PFC showed the timing at all.

with the PFC in. jump the starter by taking the ole screwdriver trick. i have aligator clips on a wire that i touch from the positve lead of the starter to the skinny black solenoid switch.

this should be straigt power tothe starter, it shouldn't cut any power to anything.

 

The starter works, it just has intermediate spark.

 

post another thread in the PFC section..It would be faster honestly to do that.
New Section is like a Basic section..You need Pro help,which won't come to you fast enough up here,unless someone stumbles upon it!
Good luck to ya..I tried!

 

Moved to PFC section. Please reply in that thread if possible.