car won't start...running rich, AFC won't turn on.

[97t4mitsu]

k, i just got done with my rebuild, evertyhing is all together, and my car won't turn over. My car will crank and all you can smell is fuel, if we unplug the inector harness, it gets to the point where the mixture is perfect and it cranks for a split second, then goes back to nothing. I'm getting spark, fuel and compression, tested all three, and the fuel was kind of obvious.

I've got an AFC and it's not turning on, and it turned on before...which leads me to think it's the harness on the ECU which is hacked into when you wire these stupid ass things, i did put some electrical cleaner on before i hooked it up, and it DID sit for about a week, so that WAS dry. What are your thoughts on this? ideas, suggestions. if it is the AFC, is there a way i can remove it and rewire it to stock? and if so, how do i do it?

thank you for your help.

 

[totaleclipse_05]

Check your AFC harness. It could maybe be grounding out somewhere. I had a friend who had that happen to him and his car wouldn't stay running. His SAFC2 WAS turning on though. The MAP wire was grounding out on the EGR pipe. Maybe you have the power wire grounded out or something. Just check over all your wiring basically.

The AFC harness should be spliced into your ECU wiring. All you should need to do to unhook it is to remove the connections to the ECU.

 

[97t4mitsu]

well...i've got the 450 injectors in, and i THOUGHT that the SAFC actually intercepts the signal and restricts the fuel going to the injectors, so that would make sense why it's just dumping fuel...my downpipe is off right now, so is my wastegate, and when my motor cranks, i just see clouds of fuel mist.

aslo, my power wire is soldered, so is my ground, and my MAP isn't even wired, i'll have to check other places though, but they're wrapped in some weird plastic wire crap, so i don't think they could be touching anything else. also my ecu makes this really high pitched noise...but when the bottom plug is out, it stops...doesn't make much sense to me. and i checked all the wiring diagrams, everything is right, but i'm gonna go buy me a new test light tomorrow and test all the connections. i'll post again on what i find out tomorrow. thanks

 

[BigRand]

Are you running a FPR with those injectors.

Because the SAFC won't be able to control the injectors.

With an FPR installed you want to get your fuel pressure as close to stock when primed. (static fuel pressure 43.5psi)

 

[97t4mitsu]

i do have an FPR, and when cranking it jumps between 42 and 44, still the same thing, but since my SAFC suddenly turning on, that leads right back to the ECU. could my lower compression/new cams/throttle body/MSD coil have anything to do with it?

 

[xXaTaXx]

i do have an FPR, and when cranking it jumps between 42 and 44, still the same thing, but since my SAFC suddenly turning on, that leads right back to the ECU. could my lower compression/new cams/throttle body/MSD coil have anything to do with it?

When you crank, does it sputter (kind of like a leaf blower when you choke it too much) Like it turns but it fires a time or two then dies?
Have you removed your intake pipe and made sure the TB is closed at crank?

Diagnosing this is difficult because you just finished a rebuild. Have you checked for shorts in your wiring or loose harnesses everywhere?

Also, Try resetting your ECU, unplug the NEG(-) terminal for 5min, then reconnect it.

Just trying to go over the things that have held me back after doing work on the DSM.
Chris

 

[VelocitàPaola]

well...i've got the 450 injectors in, and i THOUGHT that the SAFC actually intercepts the signal and restricts the fuel going to the injectors, so that would make sense why it's just dumping fuel...my downpipe is off right now, so is my wastegate, and when my motor cranks, i just see clouds of fuel mist.

aslo, my power wire is soldered, so is my ground, and my MAP isn't even wired, i'll have to check other places though, but they're wrapped in some weird plastic wire crap...

Here's what to do... rip that AFC out of your car, and smash it on the ground. I don't know what you did, but it doesn't sound correct. The AFC doesn't touch the signal to the injectors, and it does intercept the MAP signal, so that wire should be cut and spliced.

After you get that crazy thing off your car, follow each of the wires from your ECU and make sure the loom, and insulation are all in place. Look for obvious burn marks or places where wires melted together.

It's got to be all in your wiring.

could my lower compression/new cams/throttle body/MSD coil have anything to do with it?

I doubt it. It's hard to screw up a TB/coil install, and the new cams/lower CR wouldn't affect it in this way.

 

[97t4mitsu]

but why isn't my SAFC-II turning on??? there should be power going to that when my key is on...always.

 

[totaleclipse_05]

After you get that crazy thing off your car, follow each of the wires from your ECU and make sure the loom, and insulation are all in place. Look for obvious burn marks or places where wires melted together.

It's got to be all in your wiring.

What he says. Check your harness to make sure any wires are shorting out. If not, and your power is hooked up correctly for the AFC, your AFC may be dead. Just check out all the wiring on it.

Also, for you to even utilize that AFC, the MAP must be tapped for the AFC.