Does the chip (as seen in the pic) notch on a 85/86 LH go to the right or left? I forgot to check when I pulled the chip

 

The notch in the chip should be the same end of the socket as that white square on the circuit board - i.e. facing the outside edge of the board.

 

You're putting in a stock EPROM? Weird.


You have a late '86 board there, like my '86.5 came with. The board is better organized than the earlier ones, and better isolated from RFI (EG. ground traces on the board on either side of O2 sensor input). It has room for a 28 pin EPROM socket (but could only address it as if it were a 24), which is why the orientation mark is offset.

The later board comes with a x721 EPROM, with slight revisions to some of the maps (earlier versions x590, x631, 16V x527)


click larger

 

"You're putting in a stock EPROM? Weird."

I have a bad vacuum leak so I am really trying to baby the shark.

Thanks for the info guys!!!