i bought one of mikes 3 wire adjustable fcds. I have the fcd wired correctly for sure! Thats not the problem. When i adjust it using the multimeter i can only get it down to 6v. When i blow into the map sensor it goes to 5.5v and no lower. The voltage needs to be at 4.6v What should i do??

Check the wiring. It's probably mixed up. Contact Mike for help.

Mike D
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you think he might have mixed up some of the wires or something? if its not one thing its another with this car. ugh

-MIKE-

Stroked 2.2L

theres nothing i can do?? I want to go to the track today its high school nationals =(

-MIKE-

Stroked 2.2L

ruled out the fcd and the map sensor? What else could it be the ecu or harness???

-MIKE-

Stroked 2.2L

its spitting out too many volts on the signal wire. its reading 6v on the signal wire and 5.5 when blowing into it. It still wont go down at all. I dont know what to do im guessing its a problem related with the ecu and i dont know anywhere to take it. They are going to say well i cant help you the car is meant to be n/a.

-MIKE-

Stroked 2.2L

yeaah

-MIKE-

Stroked 2.2L

the signal wire right??? its the yellow/black

No, the green/yellow Vref wire. Vref should provide a relatively stable +5V with respect to chassis ground. The yellow signal wire should vary linearly according to engine vacuum.

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-Paul

Service Manuals and Guides

-MIKE-

Stroked 2.2L

so changing these wires should work?

Mike D
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wont adjust under the same thing wtf!!!!? The positive lead from the multimeter goes to the signal wire and the negative to a grounding source correct??? This is exactly what im doing and it wont adjust!! Im blowing in the map sensor too and it just wont adjust down anymore

Have you tried both directions turning the adjustment screw? What voltages are you reading?

Mike D
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yeah i have tried both directions when i adjust it to turn the voltage up it does. When i turn it down the lowest it will go is 6 without blowing into the map sensor and 5.5v when i do blow into the map sensor.

Woah, you have a 95 eclipse.

Why are you even bothering with the fcd might i ask?

Goodnight sweetheart...yes its time to go...bum bum bum bum bum...good night sweetheart yes I am one little a$$hole......bum bum bum bum....

Mike D
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Yeah, +5V is about the maximum the Vref wire should supply... can you post pictures of how wired everything?

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-Paul

Service Manuals and Guides

Not trying to be a jerk, but are you sure you are wired into the MAP sensor? Post pics please.

-MIKE-

Stroked 2.2L

it might look hard to see what goes where but

the red goes to the green/yellow wire
the black goes to the black/green wire
the blue goes to the yellow/black wire

anyone? i need to get her running good real soon.

Take the electrical tape off and remove the case on the FCD and take a picture.

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-Paul

Service Manuals and Guides

-MIKE-

Stroked 2.2L

Maybe that's the problem? You would know more than I...

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-Paul

Service Manuals and Guides

-MIKE-

Stroked 2.2L

there is no way its the fcd. The map sensor is brand new. Why the hell would the Vref wire have 6v? Is there anywhere that i could take my car for them to fix that?

-MIKE-

Stroked 2.2L

bad ground where? Should i try resoldering the black wire from the fcd to the map sensor? Maybe its not a good connection? Its weird it seems like it should be getting less voltage not more.

I don't know about that... if the ground was loose, intermittent or high impedance you might see lower Vref levels. If it was somehow connected to a negative voltage source you would see higher Vref signals, but I don't know of any negative voltage sources in cars. Another option is a damaged output driver in the ECU, but that'd be rare.

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-Paul

Service Manuals and Guides

how do i fix the damaged output driver or check to see if its damaged?

It's built into the ECU, so you'd have to get a new one if that's the problem (though I doubt it is). Disconnect everything, including the MAP sensor, and test the voltages on each wire with reference to chassis ground (meaning put the negative multimeter lead on either the battery or a clean metal part of the chassis). You should see +5V on the Vref line and 0V on the ground line if everything is as it should be.

If that checks out, you'll know the problem is with the FCD or the MAP sensor. If not, then you'll know the problem is likely in the stock wiring or the ECU.

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-Paul

Service Manuals and Guides

ok this is what i have.

Green/black=ground
Yellow/black=power
Green/yellow=Vref which i recieved a 5v signal

my question now is i have blue black and red wires on my fcd. Which goes to where? I think its black to the power and red to the ground, right Mike?? Heres a diagram of the fcd

Originally posted by 95eclipseSlow
ok this is what i have. Green/black=ground Yellow/black=power Green/yellow=Vref which i recieved a 5v signal my question now is i have blue black and red wires on my fcd. Which goes to where? I think its black to the power and red to the ground, right Mike?? Heres a diagram of the fcd

-MIKE-

Stroked 2.2L

im confused. I thought the signal wire was the vref and it was suppose to get 5v? If this isnt true then how come you tune the fcd off of the signal wire?

OMG. just hook it up like Mike said. This is the longest thread in history to have wrong wiring colors at the end of it!

.........................................................................................................................

Built. That's All...
.........................................................................................................................
www.monkeybuttpirate.com
.........................................................................................................................
2 Fingers of Scotch with a milk back... Stat!

-MIKE-

Stroked 2.2L

ok but i tried it like that once and it didnt work! Obviously something isnt right.

-MIKE-

Stroked 2.2L

Mike D
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ive hooked it up multiple times with different potentiometers and everything exactly how mike said and it just wont go to 4.6v. No matter what i do, it is rocket science when your the only one in the world with a signal wire that gives off 6v.

-MIKE-

Stroked 2.2L

link to a cheap 95 mtx ecu?

-MIKE-

Stroked 2.2L

i know and i looked on ebay nothing fairly cheap. Can a place tell if the ecu is bad?

Haha Mike send me the wire diagram again and I will make a beautiful rendering with all the colors as clear as day! It wasn't that difficult!

/

1996 Eclipse RS-Turbo

I just found a 95 ECU in the marketplace this last week for a friend. Just have to keep looking.

Mike D
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is there some kind of other approach, like wiring in some kind of resistor or diode or whatever? Cant i buy something from radio shack and just wire it into the signal wire so it stays at 4.6v instead of the fcd where i have to adjust it? There has to be something like that, that would work. I know one of you electricians know.

You can wire a 4.6V zener diode reverse-bias to the signal line and ground, but it's really not the same. You want the adjustability and voltage buffering of a quality FCD. Don't settle for less... it doesn't work as well.

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-Paul

Service Manuals and Guides

so i have to wire one of these into the signal and the ground?

I only threw that out there for the sake of argument. If you don't know anything about electronics, don't try it. You can't find this part from RadioShack. Forward-biased a diode has very little impedance, so you can easily destroy your MAP sensor or what's left of your ECU by installing it incorrectly. Fix the problem at hand then go from there: either check the stock wiring back to the ECU, replace your MAP sensor or temporarily swap in a new ECU to rule that out.

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-Paul

Service Manuals and Guides

anybody want to send me a 95 mtx ecu just so i can see if thats the problem? then i'll send it back with some cash? =)

No.

well i cleaned the fuel injectors and put a new fuel filter in and it still aint working. So should i just go for the brand new $263 ecu from the mitsu. dealer? I will get the early year one that doesnt have the fuel cut feature and hopefully it will work.

For $263 you're getting a remanufactured ECU. There's nothing wrong with that, and I doubt they even sell brand new ones, but you should be aware that it's remanufactured. Also, there's a high possibility that since it was probably recently remanufactured (as in, within the past eleven years), it was flashed with a firmware version that does trigger fuel cut if the MAP sees too much pressure: I've seen it happen before.

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-Paul

Service Manuals and Guides

Diagnose the problem insetad of throwing parts at the thing man.

Have you checked over the factory wiring and the MAP sensor?
If you did, how did you do it?

-MIKE-

Stroked 2.2L

the map sensor is brand new. I checked the wiring and there is no bare wires and nothing is grounding itself out. I think the car is leaning out and the problem is definately fuel related. I cant get my hands on a fuel pressure tester and im not going to waste $45 on one to use it one time.

Just buy one, I did and have used it on more than 1 occassion now. You bought your fuel pump brand new also?

Mike D
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yeah i bought the fuel pump brand new but off of ebay. I dont know but that is a possibility too

-MIKE-

Stroked 2.2L

$100 pump not cheap

-MIKE-

Stroked 2.2L

well it might not be fuel cut, it might be the stock injectors getting maxed out. I have the dsm 450cc injectors and the resistor pack so should i get a sfmu or a afpr? Im thinking the afpr because you dont have to deal with discs and all that and i can actually hook a gauge up to it. what do you think?

.........................................................................................................................

Built. That's All...
.........................................................................................................................
www.monkeybuttpirate.com
.........................................................................................................................
2 Fingers of Scotch with a milk back... Stat!

-MIKE-

Stroked 2.2L

Goodnight sweetheart...yes its time to go...bum bum bum bum bum...good night sweetheart yes I am one little a$$hole......bum bum bum bum....

alright i have the 450cc injectors installed along with the SFMU. I plan to set my boost between 10-14psi depending on if my boost controller works or not. Currently i do not have any kind of fcd on my car. Keep in mind the car is a 95. What should i do if it still stutters?? I am going to test drive the car tomorrow with the higher boost level. I have the largest disc and the small hard spring in the SFMU.

-MIKE-

Stroked 2.2L

actually its rebuilt! Alright so if it stutters its either i need a fcd, new computer or new map sensor wiring?

-MIKE-

Stroked 2.2L

.........................................................................................................................

Built. That's All...
.........................................................................................................................
www.monkeybuttpirate.com
.........................................................................................................................
2 Fingers of Scotch with a milk back... Stat!

sorry i have a fucking frankenstein car. thanks guys

-MIKE-

Stroked 2.2L

it still stutters. Im going to start with buying a symtech unit and work from there.

-MIKE-

Stroked 2.2L

I want to diagnose the problem that's what I need help with, Mike. Enough with the crap, lets get this bitch running good. We are starting fresh right now. What should i check for first?

.........................................................................................................................

Built. That's All...
.........................................................................................................................
www.monkeybuttpirate.com
.........................................................................................................................
2 Fingers of Scotch with a milk back... Stat!

Originally posted by eclipse982nrRST

Originally posted by 95eclipseSlow it still stutters. Im going to start with buying a symtech unit and work from there.

So, once again, your playing a guessing game and wasting more money instead of diagnosing the problem correctly.

.........................................................................................................................

Built. That's All...
.........................................................................................................................
www.monkeybuttpirate.com
.........................................................................................................................
2 Fingers of Scotch with a milk back... Stat!

Im saying, right now ive got nothing to lose so im going to try everything. Where do you suggest that i start off so i can properly diagnose this problem and get it solved?

Dude,

I dont even plan on turboing my car anytime soon.

And I know enough about FCDs from this thread now that I could do it blindfolded.

Ill give you a (second) first step:

Since you cant (wont)check it yourself, just take any money your gonna aimlessly throw out the window and take the car to SATAN, let them figure out why the hell you get 6V.

-MIKE-

Stroked 2.2L

.........................................................................................................................

Built. That's All...
.........................................................................................................................
www.monkeybuttpirate.com
.........................................................................................................................
2 Fingers of Scotch with a milk back... Stat!

whatever. Its funny that if im told oh its your map sensor i buy a new one and its not it, just shit like that. Its just whatever i guess, everything is put on right,but the guy before me fucked it up. im done trying to get help anymore.

LOL.

Great job

Close thread please.

Mike D
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Erik P.
Official 2GNT thread Hijacker
Some say that he's driven over more Covenant than he's shot, and that his grenades aren't where you'd expect them to be...
All we know is, He's not The Stig... But he is The Stig's Spartan cousin!

its funny cause i have followed all of the advice and only half the shit works. you guys say its one thing and its not and you say something else and its not. Thats not my fault. I checked everything you told me and ive dont everything youve told me. Only thing it could possibly be is the computer?

Erik P.
Official 2GNT thread Hijacker
Some say that he's driven over more Covenant than he's shot, and that his grenades aren't where you'd expect them to be...
All we know is, He's not The Stig... But he is The Stig's Spartan cousin!

Lol!

This is getting better and better!

Ultimate fail:

Erik P.
Official 2GNT thread Hijacker
Some say that he's driven over more Covenant than he's shot, and that his grenades aren't where you'd expect them to be...
All we know is, He's not The Stig... But he is The Stig's Spartan cousin!

OH,,,,! so this tread is why everyone on the board does not jump in to offer up suggestion anymore

Hahn,Wiseco,Eagle,MSD,TurboXs
K&N,mopar,AEM,Greddy,Vortex,apexi and a bunch of other stuff..