ElectronicsNeed help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?
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is the vss computer controlled.? i switched to carb and now my speedo doesn't work. ideas? I cut the computer out, all other gauges work.
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__________________ SUPERCHARGED 87 GTA: Blk/Gld, Vortech S-Trim 8lbs boost, Vortech carb enclosure, 750 mighty demon, 355cid 8.2:1 compression, Trickflow 2.02 ported heads. Best ET 12.689 @ 109.4 w/ a 1.85 60 on 255 street radials. tranny was slipping real bad, had to pedal it to shift. Plan to run 13-14lbs boost, target ET: 11.4
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can i make my factory speedo work without the computer?
__________________ SUPERCHARGED 87 GTA: Blk/Gld, Vortech S-Trim 8lbs boost, Vortech carb enclosure, 750 mighty demon, 355cid 8.2:1 compression, Trickflow 2.02 ported heads. Best ET 12.689 @ 109.4 w/ a 1.85 60 on 255 street radials. tranny was slipping real bad, had to pedal it to shift. Plan to run 13-14lbs boost, target ET: 11.4
Sorry I was a sleep, missed the part about not having the ecm.. I have been working on the Holley Stealth ram for mine, so mine will be using an ecm... My factory gauge package was removed in favor of one From Covan's Classics. So I moved my VSS to the speedometer output on the T-5, now in the process of wiring to the electric Autometer gauge. My VSS was purchased form Jags That Run, I am not 100% positive that just buying an aftermarket VSS will solve your problem.... I do know that the electric Autometer gauge's come with there on sensor....Another problem I could see would be the calibration of the speedometer. If yours is like mine it should require a 2000 pulse Vss, make sure of this... If you get one of the Covan's dash plate they look nice, I opted just for the panel and harness. No money in the budget for the Autometer guages at that time.. And you will have great looking cluster, plus you can goto a mechanical speedo.....But the calibration may take some time... Contact these site they have been more than helpful with me... http://www.eficonnection.com/eficonnection/default.aspx
Last edited by Iroczracer; 09-11-2009 at 11:12 PM.
This is what a buffer box looks like. You can find it on any TBI car GM built and several others common to junkyards everywhere
One last bit, be aware GM used two VSS connectors. Left is the older 700R4 style. Right is 4L60 (90-92). Wiring colors are the same and functions are the same
Wow guys that alsot of info, thanks. I'll have to try to figure out what to do. But i really want to keep the GTA 140 speedo and cluster.
POCKET, The ecm is actually still in the car. What would i need to do to make it all work? I can use my stock VSS and reconnect it to the cpu? will it have all the signals that it needs? Or, If i get on of those buffer boxes can i still use my stock speedo? thanks
The ecm is actually still in the car.
I can use my stock VSS and reconnect it to the cpu? will it have all the signals that it needs? Or, If i get on of those buffer boxes can i still use my stock speedo?
If the ECM is still there, I'd think you could plug and play.
JamesC
__________________ "There are more things in heaven and earth, Horatio, / Than are dreamt of in your philosophy." Hamlet
i just don't know what wires to hook up to complete the circut. I cut the whole harness in half by the heater box, it is accessable, and i have the VSS that i can plug back in, how does it connect to the speedo? anyone care to shed light here? pocket? thanks
ive been reading alot of these. speedo problems, i have a bone stock 89 firebird with a 5.0 TBI. im having a similar problem. my speedo works but dosnt read right. and the odometer dosnt work at all. is the VSS buffer box the most likely problem or the VSS its self? if its the buffer box where would i find it in my car?
I am having the same problem with my swap...and the buffer box is a difficult part to find anymore. The wireing diagrams state that the buffer box sends a 4000 pulse directly to the speedometer (which is what the vss is sending) and a 2000 pulse signal to the ECM for the other stuff (IAC valve...etc.) Sometime in the near future, I am going to try to run a line directly into the speedometer input wire at 4000 pulse. It looks like this might work because the circuit board in the gauge cluster is what takes care of that signal. I'll let you know what I come up with
joshhsi got to http://www.jagsthatrun.com/Pages/Spe...eedometer.html
Use a 2PRS unit it will bolt onto the cable output on the trans. My vss wires going to the ecm brown/white stripe ( A10). I have not went back to the stock cable, an electric Autometer should work. Because they are programmable. I mounted mine to the trans and ordered wire and pins from efi connection.Then used the white connector, then one that goes to your dash. Think it's 16 pin MetoPack 280 unsealed. Ran the wire through this connector and through dash harness. The Autometer speedo will have one input for the vss and one output for the ecm. You can use your wires that are already there going to the ecm...I have a Covan,s dash and there wiring harrness..Do not have the full range of gauges yet..
SUPERCHARGED 87 GTA: Blk/Gld, Vortech S-Trim 8lbs boost, Vortech carb enclosure, 750 mighty demon, 355cid 8.2:1 compression, Trickflow 2.02 ported heads. Best ET 12.689 @ 109.4 w/ a 1.85 60 on 255 street radials. tranny was slipping real bad, had to pedal it to shift. Plan to run 13-14lbs boost, target ET: 11.4 
