Hello-
I just bought a 1991 GTA, AT with 5.7 with 48K miles on it. I took it out on the highway and floored it; the engine seemed to spin up, but the transmission didn't go into overdrive. Shortly after that, the SERVICE ENGINE SOON idiot light came on.
I tested this several times, including shutting the engine off, and repeating the procedure and got the same result every time.
I checked the AT fluid levels and they were spot on.
Regardless, I will take it to the GM dealer for service, but what can I expect? Is it a transmission problem, catalytic converter problem, both, or something else?
Thanks,
d

 

Hi,

I can't help you because I have a 5 speed, but you might want to post this question in the transmission section instead of interiors.

Good luck.

 

Does the tranny shift into overdrive during normal driving conditions. The 700r-4 isn't designed to shift into overdrive when floored. There is a valve you can order (summit or jegs) to fix it. Also make sure your tv cable isn't slipping when you nail it (ie. coming out of its adjustment housing). Sometimes the tab won't hold it if its worn.