Some of you might remember me posting a few weeks ago about tracking down a misfire problem in my GTO. I did a new fuel system build, and figured I might have had some contamination in the fuel system (my own fault). I took the opportunity to put new ID1050X injectors in the car while I was digging into it. The new injectors work fine, but the misfire was still present. I took a look at the spark plug and it looked fine, but to be sure I swapped the plug, plug wire, and coil with another cylinder. That had no change, which suggested that perhaps that cylinder either had some internal problem, or was not getting fuel.

I did a quick compression check on that cylinder and it checked out fine. I them remembered that the racelogic traction control system intercepts all 8 fuel injector drivers. When I installed it I did it with the connectors such that it was easy to bypass it. I did the bypass and all 8 cylinders worked great. After a bit more playing around it seems the connector on the Racelogic unit itself is the problem, because I can wiggle it and get it to work. It might be the connector solder joints on the board, so I might just crack the unit open and reflow it.