I just bought a 89 Vette M6. While changing the spark plug wires last night I tore the wire out of some sensor on a metal tube which comes off the pass exhaust manifold and runs up to the distributer area. It is wrapped in heat shield and has what looks to be some kind of temp sensor sticking out the top of it right over the rear of the pass valve cover. Anyone know what that sensor is? I can't replace it if I Don't even know what it is called. Thanks.
Steve in SC

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99 Z28 SS Red/Blk M6, Ripper, Flowmaster, 307rwhp
88 GTA L98 A4, GunMetal/Blk, Borla Exhaust
89 Vette M6 Red/Blk, something to play with
87 IROC L98 A4, White/Gry

 

I'll take a stab at this, although I've never seen a vette engine of the year before. Since the corvette heads had no egr crossover, they had to plumb the exhaust. If you think it looks like a temp sensor, it may be something having to do with the egr itself, such as the egr temp sensor.

 

EGR temperature diagnostic switch - GM P/N 14087416 if my guess is correct.