Hello, I've been working on my 92 RS, converting the TBI to TPI. I got all my parts for the swap from a badly wrecked 92 z-28 that still ran great. Switching everything out was pretty straight forward, and the engine fired right up on the first crank. The increase in power was very noticable, but still too soon to see any mileage increase.
I still have a couple gremlins though and I hope someone can help. I changed the single fan to dual fans, and neither one will turn on. Do I need to add relays or fuses or anything? The bracket that holds the fuel pump relay and fan relay was changed with the wiring harness, and there was an extra relay that te TBI harness didn't have, I assumed this was the extra relay for the dual fans. All gauges are working, except the speedometer is dead, I can live without it, but it would be nice to know how fast I'm going. ANy help would be great.

-Dave

 

The fan wiring can be found here:

ftp://ftp.diy-efi.org/pub/gmecm/man...7730v8tpi-4.jpg

With the key on, engine off, short A & B on the ALDL connector. One of the two fans should run. The other fan is controlled by the head temperature switch and the A/C high pressure switch.

RBob.