ok so i was throwing a few codes a while back and i got everything cleared up. but now when i get going about 70-75 on the interstate the check engine light comes on and it throw the VSS code. wtf is it doing this. its working perfectly. i dissconnected the cable once to clean out my guages but i connected it back. it works. i just want to know why my light comes on if it works. anyone else ever have this problem?

 

The speedo in the cluster is mechanically driven. The VSS is a mechanically-driven electrical unit that sends pulses, with the # of pulses sent per time unit dependent on speed, to the ECU. If the VSS sending unit it malfunctioning you won't see a problem with the speedo like you would with an electrical unit in the transmission. Right now I'd expect that your ECU isn't seeing the VSS output; as far as it knows you're free-revving the car in your garage. It has no other way to know the car's moving except when you coast down in gear, and that's usually where you'll throw a VSS code (though sometimes the ECU will figure it out under high-load conditions, like WOT).

Try another gauge cluster!

 

i know that the gas guage doesnt work properly, and now this. i guess ill start looking for an SI cluster. do you know if its plug and play? i have an std

 

Get one from the same year and it should be... I'm not 100% on that though.

I know we plugged an Si '89 cluster into an '88 STD and it worked fine, except we had a similar problem with the VSS on the Si cluster, so we swapped back

 

damnit. well ill try to find one. i hope they dont try to charge me an arm and a leg. btw what redline would i have if i get a tach? like 5?

 

*shrugs* Tach just indicates the rpm, doesn't dictate your redline Your ECU will dictate that. I'm not sure what an STD can go up to, though!

 

i know the ecu determins it. but i dont wanna redline it intentionally to find out what it is. ill look like a fool...

 

Why? Unless you can find the specs, that's really the only way to tell!