I am trying to correctly set the timing on my car. I have read that you need to disconnect the TPS connector. On my 93 auto NX the lead that goes to the TPS branches into 2 connectors. If I disconnect connector #1 the timing reads slightly higher than with it connected. If I also disconnect connector #2 it reads a little higher still. My question is should both be disconnected when setting timing? Connector #1 has red, white and black wires. Connector #2 has green, white and green/white combo wires. The stick SR20's I have looked at only have connector #1, I think. I'm not sure what the second connector is for, or if only automatics have it.

http://home2.owc.net/~keithert/pics/tps.JPG

Accoding to my fsm or how i read it is that the 3 pin connector thats flat is the TPS and the square 4 pin plug is the closed throtle position switch. thats for the auto tranny. or something like that. its only on the autos, the manual's got a different tps on them that has the plug down on the TB itself. Whats werid is they dont have a specfic test for the auto for the tps voltage settings. just for the closed throtle positon switch. dang autos...

What's funny/strange, is that the FSM for a B13 shows only the TPS for an automatic SR20. The 3 wire connector is the one to disconnect. Are you putting the car in timing mode after you disconnect the TPS?

Are you putting the car in timing mode after you disconnect the TPS?

I do rev the engine 3 times after disconnecting the TPS, but I don't understand what doing that does?