I just fired up my truck after a couple of months of being non-op,I used a 90mm ls7 t-body,90mm j-tube,and Dr.X harness only.I have a speartech harness and tach module but did not install them.With the key in the "on" position I step on the gas pedal and the throttle blade is not moving...at all.Do I need to use the tac module with the Dr.X harness?or all by itself? Either way do you guys have any ideas...Thanks

 

I believe you need your stock Tac installed

 

Thats what i'm using,and still no movement of the throttle body

 

Pink wire still hooked up? Got power to it?

 

Yeah, don't forget, the pink wire goes to the a/c to get a 5 volt reference.
Don't use the Speartech harness, and leave your factory tac module

 

I got the wire in the right spot and have the stock tac module on,i'll try again today.......

 

There has got to be a better place to get the 5V reference for this mod.

 

Just leave your stock TAC module in place as per the written/online instructions. Is it going into REP mode at key on? If so, the blade won't operate. Any codes set? Make sure that the purple/grey center caps in the connectors are snapped in all the way and that both of the connectors are fully seated. Also make sure that the throttle blade is not sticking at any point in its travel when you move it by hand. Only issue I have come across so far was a bad/misadjusted TB.

Only suitable 5V refs appear to be the AC, MAP and possibly Evap. Don't really want to mess with the MAP and the AC is more convenient than running back to the PCM for the Evap. A new 5V ref could be generated but more wiring would be involved. It would generate heat within the unit if it was integrated. The unit might also have to be larger. 5V ref circuit boards can be easily found if someone wants to do some extra wiring. But the AC 5V ref is a lot more convenient and works fine.

Mocked up a new mounting option.......

 

Ok..I just got back from trying to get the throttle body issue fixed and still no movement in the throttle blade.I used the Drx harness with my stock tac,and I used the Speartech harness with thier tac.My truck will start ,but it goes right into R.E.P mode.Its throwing 3 codes that are all throttle position sensor related,and after I clear them they come right back with key on...not started.Any more Ideas anyone

 

ever get this sorted out?