[scarceller]

When you jumper the B&C pins you are actually jumpering the WOT switch closed. If you look at the schematics for these cars you'll see that the B&C pins simply short out the WOT switch. Normally this would instruct the DME to use the WOT maps but since this idle adjustment procedure is ONLY done at idle then the Idle Switch is also closed this means that both the WOT switch and the Idle switch are now closed and grounded. This condition is NEVER possible except for when setting base idle.

So it's VERY important that the idle switch is functioning correctly when jumpering B&C pins, you need to be 100% certain that the idle switch is closed and grounding the Idle Switch signal line back to the DME.

I also recommend unplugging the O2 sensor when setting base idle, I know the official procedure says to plug it in to set base idle but I suggest you unplug the sensor and see if the AFR changes.

In summary:
- Warm car up
- be sure throttle plate is at idle stop
- jumper B&C
- Jumper Idle Switch
- unplug O2 sensor
- what's your AFR?
- remove vacuum line from Fuel Pressure Requlator, what's the AFR now? It should go richer with line disconnected from FPR.