Shoe i thought it said 93 so you are correct about 94 DONT flash codes....

95chevyz28- once you use up datamaster you caint uninstall and re install it you must purchace it once the 20 times is used.

 

You thought what said 93? The OP has a 94 in his sig. Yes, I am correct that you cannot flash codes on 1994 and later LT1s.

 

Ah. I thought I read somewhere that you can uninstall it and just re-install it. My apologies, I stand corrected...

 

okay I got a cable and got tuner pro, its free and supposed to be pretty good. if that dont work try datamaster

 

I'm having the same problem. I used different scanners, and still getting the same. The car sat for a year or so, with running it every other week. This is really pissing me off..

 

Any news on the "not communicating"? I have a LT1 94 vette pcm that has been flashed and wired for stand alone and it runs for 3 seconds then dies. But it wont talk to a scanner, I have tried 2 different scanners.

 

Ive had some issues in the past with certain scan tools not being able to communicate but the car runs a1. It was pretty bad though we were using one of those super expensive scantools and it wouldnt read and then we use a cheaper one and she reads no problem.

 

I have tried the auto x ray and a matco-determinator (I think) both w/ no results.