just got a 89 supra and wont rev past 2700

[thejrman]

well i just picked up a 89 turbo supra from a friend for a good price and
There is a solid state resistor wired into two wires that went to the original maf sensor, this is what maks the car run at all. the other 4 wires for the original maf are just chilllin there not hooked to anything. at 2000-2500, depending on f it is warmed up or not, the computer thinks it need to cut the fuel(like a govenor/rev limiter), the remaining fuel in the engine will let it get to 2300-2700 before it runs out of fuel. revs come down, fuel kicks in, and you are running till you hit it again. it will still build 5-6psi boost and its trowing the maf code im not sure what i should do with the extra wires ill get pix of them and u can let me know what thay go to im not sure if its just those extra wires that r making it run like that and there r only 2 of the wires hooked up for the vpc so if anyone has a wireing diagram for it or has a right up on it any ideas will help

this is every thing done to it
HKS vein pressure converter conversion
SAFC neo
new 70 trim turbo
680cc injectors
XS Power large front-mount intercooler
full 3" exhaust
external wastegate
aftermarket BOV

thanks for looking and for all your help
zach

 

[bowsercake]

The ECU will hit fuel cut right around then if it does not detect the AFM, which, since yours is cut it does not. Now, you say you have a resistor wired in so maybe your friend did that to try to eliminate the code from being thrown since he was using the VPC. Sounds like that was a dumb mistake.

I assume that your friend cut his wires and went with VPC because his AFM was broken. You should buy a used AFM from someone on this forum (post in the parts wanted section) and wire it in and run it with the VPC. With out an AFM signal the ECU will reset to some default values, you need a working AFM and tuning to get rid of the fuel cut.

You might want to try to see if the AFM you have works, but, it might be pretty FUBAR'd after Bubba got to it.

 

[thejrman]

well i a new motor harness that he threw in so i can replace that isnt the vpc used so u dont need the afm? well could it also be doing it cause the vpc isnt hooked up all the way only the green and one other wire r hooked up so do u think that could be making it run like that

 

[thejrman]

well i went and looked at it cause i was going to rewire the vpc and safc and well the safc wasn't hooked up right so now im going to replace the motor harness and just get the plug and play harnesses for the vpc and safc but i cant find a safc p&p harness for a supra :1zhelp: :cry:

 

[LordLo]

First of all, take that resistor out of the AFM wires. Reconnect those cut AFM wires. That should solve your problem rev limit problem, if not also make sure the AFM signal is connected on the SAFC and it's set to Karman airflow meter; if it's not set to Karman type, it'll rev limit you to around 3000 rpms. :biglaugh:

 

[thejrman]

First of all, take that resistor out of the AFM wires. Reconnect those cut AFM wires. That should solve your problem rev limit problem, if not also make sure the AFM signal is connected on the SAFC and it's set to Karman airflow meter; if it's not set to Karman type, it'll rev limit you to around 3000 rpms. :biglaugh:

its kind of harder then that they r both hacked like there is no tomorrow
here is the motor harness thats only part of it. it gets worse :runaway:

and the the ecu plugs

 

[Poodles]

um....

WHAT THE FUCK?

hacked harnesses are FTL, PERIOD.

 

[kntmikado]

Excuse me. I need to go pour some bleach in my eyes now, as a futile attempt to erase the horror of what I just saw.

Seriously, get that butchered crap out of there if it looks like that.

 

[thejrman]

um....

WHAT THE FUCK?

hacked harnesses are FTL, PERIOD.

yea ill get u pix of the rest of the harness and of it out of the car

Excuse me. I need to go pour some bleach in my eyes now, as a futile attempt to erase the horror of what I just saw.

Seriously, get that butchered crap out of there if it looks like that.

lol
it should be gone in a week or so

 

[Poodles]

seriously...

Previous owner left the front heat sheidl off the manifold, causing the heat to destroy all the wiring on that side...

$1K+ later with a new wiring harness, CPS, and sensors (got hot enough to cause them to crumble) it runs great.

I will NEVER hack a harness, I will make field harnesses or adapters...

 

[thejrman]

well i started taking the wiring harness out and i have one or 2 clips left so i desided to grab he new one that came with the can what what do i find ??????










thats right another cut up harness ::hang::

and the dizzy i have another on in he back of the car but im not sure if its any good or not

 

[MDCmotorsports]

Thats a CPS not a dizzy.

I hope you timed it right...

Would like to see what turbo and manifold you have on there too...

 

[thejrman]

Thats a CPS not a dizzy.

I hope you timed it right...

Would like to see what turbo and manifold you have on there too...

i couldnt remember what it was called and i didnt touch the timing

and ill get pix of the turbo and manifold im not sure what brands they r i just knoe the turbo it 70mm t3

 

[thejrman]

well i worked on it more and got the harness out
and well i snaped pix of the harness
now i have to wait to get back from jersey and try to find a new motor harness and get it going again
every injector was like this

wiring for the coil pack

the plugs for the ecu

how the safc was wired

and pix of my turbo and manifold that MDCmotorsports asked for

 

[MDCmotorsports]

Well you've got a decent platform to start on, but really...


GO BUY A NEW TOYOTA HARNESS and be done with the damn thing.

 

[thejrman]

Well you've got a decent platform to start on, but really...


GO BUY A NEW TOYOTA HARNESS and be done with the damn thing.

i just called them they want 500-600 for one and if they order the wrong one im stuck with it. the guy was saying there are 200 different options of harnesses he said i have to give him my vin so they get me the right one i hate messing with the dealer ships around here

 

[OneJoeZee]

I'd gladly pay 500 bucks for a new harness instead of dealing with the headaches of one that's hacked up.

Harness issues are dirty evil bitches.

 

[thejrman]

I'd gladly pay 500 bucks for a new harness instead of dealing with the headaches of one that's hacked up.

Harness issues are dirty evil bitches.

im planing on getting one but i but i have to see how my funds r. i should be starting a new job at this new indoor go karting place when i get back from NJ :icon_bigg

 

[suprajosh]

K1?????


i work there, its cool... kinda, i get free races, thats the only reason im there, i have another job i work at for money hahaha, anyway goodluck, get that thing and get it done, ask for a discount or somthing, i get one, all i do is ask, they give it
-josh

 

[Dan_Gyoba]

Yeah, a new harness is spendy. Maybe you can get one from a wreck for cheaper, but you'd better make sure that the year and options match, or you're in for more issues. Not much fun.

BTW, another issue that can cause FCO at low RPM is iof the TPS is messed up. If the IDL and E2 pins are shorted, the TCCS will trigger FCO at about 2000-2500 RPM. (I don't remember the exact point, it was 2000 RPM on my '89NA engine, I haven't experimented with my current turbo engine.