Trying to find a good scanner for use with 80's GM CCC systems but no one really knows much about them. I'm not looking for a code reader, but an actual real time scanner that tells you all the info your ECM is seeing ( like TPS voltage, temp sensor reading, EGR on/off, dwell etc. ). So what's a good affordable scanner and where's a good place to pick one up? EDIT; I see I have posted this in the wrong section. I'm not used to your message boards having so many categories.

I picked up an Autoxray EZ-Scan 3000 off ebay for $80 several months ago. I use it on my daughters '84 CCC 305 T/A and my car with '95 LT1 drivetrain.

I just bought the 5000 version of that yesterday for a good price but don't have it yet.

I've been getting contradictory information on exactly what info this scanner will display in the old 80's C3 carbed cars. Care to share?

I bought a innova form orelliys, its done good by me so far. Reads some real time data.

It will provide everything the ECM sees except for spark knocks/timing if your engine has the KS. The important stuff by my memory: voltage, temp, VAC voltage, TPS voltage, dwell, O2 counts, air diverter status, tcc lockup, vehicle speed, lean/rich. My 84 will show some timing info but it doesn't have a KS.

I've read that plugging it in disables knock retard while it's scanning. Either way it was no help to me a year or so ago when I was attempting to diagnose a spark knock/retard issue.

You forgot RPM, NAF.

OK, thanks guys. That was all the information I was hoping would be displayed.