I keep getting this code and I changed the sensor behind the speedo, I swapped out the auto chip for the 5 spped chip and I am still getting this code.

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.

 

BZ,

Are you getting pulses from the VSS? You should get about 2,002 pulses per mile in final drive. The pulses should be a square wave DC at a varying P-P voltage and frequency, but should be at about a 30-50% duty cycle.

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Later,
Vader
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"Fear is how I fall, Confusing what is real..."
Adobe Acrobat Reader

 

Vader, could you explain to me exactly what to do, I don't have a clue on how to go about checking this stuff, mt speedo in cable driven just incase that makes a diffrence. Thanks alot

 

i'm getting this same code lately, dunno why, im using a hypertech chip and i have a 5 speed, what does the VSS control? i'll be driving down the street it comes on, then after a while it'll go off.

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86 Camaro with 88 305 LB9 using 86 carb setup, edelbrock performer manifold, 305 S/R Torquer Heads, Hedman Headers, Crane Compucam 2032 edelbrock cat-back, gutted cat, slp underdrive pulley, mallory ignition, 305 h.o dual snorkel air cleaner, hypertech thermomaster chip,160 degree thermostat, 5-speed, 3.23 posi

95 Beretta Z26, 3100 V6, 4 Speed auto, stock

 

It comes on when I first start the car for the day, it will go off as soon as I move.

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Taylor Spiro-pro wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.

 

BZ,

The VSS is supposed to report vehicle speed to the ECM. About the only things it would be used for on your engine would be the SHIFT light, electric fan cut-off.

When the ECM has a tachometer input and no clutch safety switch with some VSS inpit, it calculates the vehicle speed and engine speed to determine what gear you are in. At a given RPM and TPS input, the ECM will turn on the SHIFT light. At 40MPH (or so) the ECM will shut off the electric cooling fan(s). At 118 MPH (or so) the ECM will cut off fuel on an EFI engine, not on your carbed engine.

You may have some VSS pulses occurring when the vehicle is not in motion, confusing the ECM when it expects a certain ratio of RPM and VSS pulses. About he only way you could be generating pulses when standing still is with a stray voltage, bad ground, or intermittent connection causing the ECM to interpret the voltage change as a VSS pulse.

Unless you have a stray signal or your PROM is poorly programmed, you should never get a VSS DTC when the car has just been started and hasn't been moved. That's a baffler.

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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader

 

vader you said somthing about a clutch safety switch, I don't have a safety switch in my car, I never installed it when I did the swap, could that cause it? thanks

 

btt

 

btt

 

btt