alright so im just double checkin everything cuz ive finished my tpi swap and i still cant get the car on. i have the manual for the car (91 camaro) and i looked for the c207 schematic but it only shows the color of the wires but doesnt say what they're for. i want to know what theyre for cuz two of the wires on the clear connector dont match the schematic. On "M" my manual shows that it should be an ORANGE wire and i have a BLACK n WHITE. On "D" the manual shows a GRAY wire and i have a BROWN wire. everything else matches up fine. i dont know if this matters at all. maybe its just cuz the harness isnt from the same year and its just a different color but still i want to make sure so i can move on and try to figure out what it could be.

 

http://www.austinthirdgen.org/index.php?pid=19

At the bottom, shows C207 for a 1992 car, should be the same. There's a ton of 1992 car diags there, all should be same as your 1991.

 

hey thanx camaronewbie thats a great link. the "M" wire doesnt concern me anymore cuz its for the underhood light which i dont even have so that doesnt matter. but for the "D" it should be grey and mines brown. it says the grey wire is for "tuned port injection" but i still dont know where it goes to. i looked at the 89 c207 schematic and i found that "D" is a brown wire and its for a coolant fan. i dont think this one wire is my problem but still if anyone knows what the grey wire goes to plz let me know

 

You have a TBI engine so your speedo diagram is a bit different

Take the TPI C207 and move pin D (gry) to pin K (empty, brn for dash harness). Find the buffer box and splice pins C and F together. After that a 90-92 TPI harness will plug in and work perfectly

http://www.austinthirdgen.org/mkport...SS_V8_vinE.jpg

 

hey pocket can u explain a lil bit more. my pin D on the clear connector is brown not grey. thats why i wasnt sure about it. so r u sayin to move that one to pin K? and the buffer box where is it?

 

if u have a TPI and went to carb, the VSS is built into the tranny, and the buffer box into the ecm. if u dont want cruise control, cant you just spice the yellow/purple connecter to the clear connecter under the dash( i believe the c207)

this would help me ALOT. the vss on my tranny is 4000 pulse...the speedo is 4000 pulse, so in theory this should work right????

 

Alldata and all the 90-92 V6/TPIs Ive messed with were gray. If its on pin D for your TPI harness, its the one you want. Move it to pin K, a small pointy tool like a pick or large paper clip will disengage the lock tab

Buffer box is behind the pass trim panel just above the hush panel and under the map pocket. It will be yellow or beige colored. FInd it, unplug it, and splice pins C & F together

Not so simple, the signal is a different wave type. You need a buffer box and the two wires from the VSS. Once the box is in with power, grd and the two VSS wires, the 4,000pmm signal goes to C207 pin D and one of the 2,000ppms to cruise if retained

 

im alittle confused, do i need the buffer box, or can i splice the yellow/purple wire from the tranny connecter (vss) to that clear (c207) connecter? i believe my car didnt come with a buffer box, it was all including in the ecm

 

V6/TPI to carb, you need to add a buffer box
TBI to carb, just leave the VSS wires and buffer box in place
V6 to TPI, plug it in
TBI to TPI, bypass the buffer box as described

 

??????? if i wanted to go from tranny right into the c207 connecter will that work and what would i splice the purple and yellow wire too on the c207 connector, i had a 305 TBI now, non ecu carbed. VSS was built into tranny so i dont see the point in a buffer box, i will NOT be using cruise control

 

TBI already has the buffer box. No need to change anything

 

Yea I have 350 TPI vss is built in to tranny and buffer box is in ecm. I took ecm out
What do I do now? It seems like I Dont need a vss box because I'm not using cc....in theory this is correct right???

 

Hey pocket, do you mean add a jumper wire between pins c and f while the buffer is plugged in as usual? You are saying not to unplug anything on the buffer box and just add a jumper between pins C and F right? Please correct me if i am wrong here.

 

Is this why i am getting no data from my pcm through my aldl port? could this have something to do with it not connecting? I mean it looks like i still have the tbi harness in my tpi car (swap). So i should just unplug the buffer box altogether? Just jumping pins C and F? Then how is my vss communicating to the ecm? Need your help on this one.

 

You are bypassing the box, which means it goes away. Im not sure what whould happen connecting the two and having the buffer box hooked up would do. One side has 2,000ppm signal, the other, 4,000ppm. Mixing them may get interesting

VSS is ran to the ECM on a V6/TPI car. TBIs it goes to the buffer box to be decoded then sent to the ECM. If your TPI harness is not getting a VSS signal, then you either have a bad VSS, unplugged VSS, break in the wiring or something of that nature