[rpoz-29]

I'm looking at a 1993 Corvette 6 speed. It's a two owner car, the second owner being an old friend of mine. He passed away in January of 2015, and his sister has decided to sell it. It's black on black with a leather interior, and only 17,000 miles. I can get it pretty cheap, but wondered if there were any well know trouble spots with that year. Not planning to autocross it, just a street ride.

[mr.beachcomber]

These Vettes didn't have a cold start injector (1988 was the last year). The ECM controlled the mixture while in open loop and it was fairly rich. Once the system went closed loop, the idle mixture was controlled by the ECM using inputs from the MAP sensor, throttle position sensor, idle control valve, oxygen sensors, and temperature sensors for both the coolant and the air inside the intake.

If the car idles poorly in closed loop, look for a vacuum leak if the mixture is too lean or a faulty idle control valve if the engine hunts for an idle rpm. They usually get gunked up over a period of time from oil mist in the throttle body/intake. You can clean it with carb cleaner if you're careful not to get the spray inside the electrical container.

Hope this helps. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/beerchug.gif)