My daily driver is a 2002 corvette, I recently took in in for a custom dyno tune. The car is bone dry stock except for a vararam ram air kit, upgraded clutch, and exhaust. The exhaust has no pre-cats and 100 cell race oriented main cats and SLP cat back. They couldn't nail down the tune because the the knock count was through the roof. I took the car home, did the basic stuff, cleaned the mass air, fresh set of plugs, msd super conductor wires and a fuel filter then I added some injector cleaner and topped off the tank with shell 93 octane. I drove the car for two days no trouble codes popped up, good to go. I took it back to so they could remove the pre-cats and finish the tune. I get a call back several hours later and they inform me that my pcm is fried and they don't know why. The next day they install a new PCM and try to install my factory flash back into the pcm and boom, that one supposedly instantly fried as well. Today they call me and told me that I installed the plugs wrong and broke the coolant temp sensor which caused a direct short and the problem is my fault because I'm not smart enough to change my own spark plugs. I'm no General Motors OBDII genius but it sounds like a pile of crap to me. I'm a little ticked at them already, they tried to sale me a clutch when my current clutch has less than 600 miles on it, I'm pretty sure they're just trying to empty my cookie jar.

1. If I did somehow eff up and break the coolant temp sensor why was there no codes? Why did the cooling fans still work? Why did the gauge still function?
2. Has anyone ever seen a "shorted out" temp sensor chicken fry a pcm?

 

You wouldn't of been able to drive it to their shop with a shorted out IAT sensor. The shop is bending you over. The only time I've seen pcm's lockup or be damaged is by careless usage/tuning or cars that had obvious longtime issues.

 

It's not the IAT sensor, it's the engine temp/coolant temp sensor.

 

Yeah I typed it incorrectly, IAT instead of ECT. But the same basic operation function would of happened as the engine would've been constantly in engine protection mode or severe reduced power mode.

 

That's what I thought. Thanks for the reply.