FCD Install = CEL and NO BOOST???

[mexie-subie]

Ok, so i just recently purchased an FCD from a member on here that got it from the guys that makes them and sells them online as the plug and play system. i followed the instructions to install it, (this was brand new BTW) and when i turned on the car i am getting no boost (hitting fuelcut at .5 psi) and a CEL that i am pretty sure is for the FCD interrupting.... i am very frustrated, because i reset the ecu and double checked all the wiring and everything, the lights on the FCD light up but it gets extremely hot and i don't know what to do! i am stuck right now w/ no car to drive unless i want to go everywhere under 30% throttle.

Car specs are
93 Legacy SS
ej20g engine w/ 22t wiring harness
td04
06 TMIC
generic BOV
turbo xs boost controller
intake
4" DP
3" CBE
and probably more but i just need this fixed! please somebody help me!

[mexie-subie]

I don't know if because i just reset the ECU and i am trying to drive on it, but now my car is at a very very low vacuum. only in first gear is it at a full vacuum but anything else it is barely vacuuming. please let me know if you guys have any ideas.

[bmxkelowna]

i tried installing a fcd i bought from here years ago (maybe like 4 years ago?) and the same thing happened to me, turns out ether i installed it wrong or the directions were wrong and it fired the map stuff in side the ecu and i had to replace the ecu

[Legacy777]

Can you post the instructions for how to install the FCD?

I'd recommend removing the FCD until we can verify the instructions are correct.

[mexie-subie]

http://fcd.chrispaiano.com/ are the instructions i followed, i emailed the guy and he is saying that it could be an issue with my connections, i am going to go home tonight and check out the connections and double check that it is all wired and there aren't any missing connections so i will check it out, hopefully i don' t need to replace my ecu, i will be very very disappointed.. let me know if you guys have any other ideas.

[Legacy777]

Are you using those red alligator type clips? I do not care for those, so yeah, you may want to verify your wiring that it's done correctly.

[mexie-subie]

yes, i used the alligator clips and i just went out on my lunch break and unclipped those clips that i used last night and 2 of the wires weren't even broken through, i then just wanted to see if there were any problems w/ my ecu so i re connected the wires that were cut and turned on the car, NO CEL, so i am happy that i didn't screw anything up, i am going to be soldering those wires when i get home tonight so that they have a nice strong connection, i am pretty sure that i was just being stupid in the way that i was hooking it up, i will let you guys know and thanks for the help!

[Legacy777]

What I would suggest to use is weather type crimp connectors where you have cut the wire. The crimp connections resist vibration better than solder joints. For the connections where you're just tapping into the stock wire, use a razor blade and cut back the insulation, then use a small pointy screw driver and spread the stock wiring apart a little bit and then run the wire you're trying to connect to it through there and wrap it around the stock wiring. You can use a little bit of solder on this joint to keep it from loosening up.

Does that make sense?

[mexie-subie]

yes that makes sense thanks very much for your help, i am going to be doing this as soon as i get home, i will let you guys know later on when i get it completed if everything goes well.

[mexie-subie]

so i have just given up, i tried to hook it up different ways yesterday, i made sure that they were all connected but the voltage readings that i was getting were not what they should, i probably just bought a faulty one or whatever, i just kept getting Fuel cut after boost w/ a CEL, so i have moved on to a different/cheaper FCD, which is the check valve that i have seen others use, my questions is, is where do you hook it up? between the MAP and the pressure sensor or between the manifold and the MAP? and i am planning on just recirculating the air from the check valve back into the intake so it will be a closed loop, one more question, when i get off boost, from doing hard boost my car will just die while driving, it seems that maybe my BOV might be releasing too much air and it looses all of its pressure, could this be correct? if so i will be needing to make an adapter for a BPV to be routed. please let me know guys, thanks for the help!.

[Legacy777]

Just an FYI, the MAP sensor is the pressure sensor.

I don't know exactly how the check valve is setup, but you'll probably want to put it in the line from the intake manifold that goes to the pressure exchange solenoid. That way you're not altering anything from the pressure exchange solenoid to the MAP sensor.

Your car is dieing because of the BOV. The engine goes super rich when you get off the gas and the engine can't compensate. You should replace your BOV with a BPV.

[mexie-subie]

first of all my apologies i meant the pressure exchange solenoid to the MAP, ok, because i was looking at a post that had this on it under the cheap FCD thread, along with being what is needed. please let me know because it looks like it is being routed in between the solenoid and the sensor. but if this isn't correct i would like to know before i hook it all up ya know? ha ha or if you guys have any ideas on a cheap pneumatic fcd that is a for sure way to eliminate fuel cut then please let me know thanks guys!

[Legacy777]

That picture does have it hooked up between the pressure exchange solenoid and the MAP. You can easily just put it in the vacuum line going to the pressure exchange solenoid. It won't matter.

The reason I suggest to put it before the pressure exchange solenoid is because the MAP sensor still needs to read atmospheric pressure correctly, and just to eliminate the chance of that vacuum check valve altering things, putting it before the pressure exchange solenoid would do that.