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post #4 of (permalink) Old 02-03-2007, 05:39 PM
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Alright, here goes... this is for disabling the SET valve.

The SET valve's servo motor resets itself every time you turn the ignition on. First it rotates clockwise fully closed, then counter-clockwise fully open, and then clockwise again until it stops, the valve stays about one third open. This is the position used at idling. You need to understand this cycle because you will be disabling the valve in the fully open position! It take a couple seconds to cycle, so you'll have time to do it.

1. Turn the ignition on until the SET valve rotates FULLY OPEN. Turn the ignition off immediately before the valve can move back to the starting position. It is now set fully open. You can remove the muffler and look down the pipe with a flashlight to verify that it's open if you want to.

2. The SET servo motor is in the right side of the tail section attached to the sub-frame. Unplug the 2 connectors that come from the SET valve motor and tape them up.

3. Here's the fun part. You want to make that pesky flashing FI light go away, right? 'Cause it will flash with this mod, or if you install any aftermarket full exhaust. First, find your ECU. It's the BLACK box next to the grey box under the seat with the BLACK wiring connector attached. Unplug the black connector. Now locate the #30 wire. What's the #30 wire? It controls the FI trouble light for the SET valve system. Nothing else.

4. There are two rows of wires in the connector. The top row is #1-17 and #18-34 are on the bottom. So number 30 is on the bottom when connected, 5 wires over from the far right end. When you unplug the connector and turn it over you can see it as pictured below. It should be black wire w/brown stripe. Don't worry too much what color it is. Looking closely you can also see the numbering on the sides of the plug - 30. Disconnect this wire. Just gently pull it out, you don't need to cut it but you can if you want. It should come out very easily, but you may find using a tiny screwdriver helps. Tape the metal part of the wire up and then reconnect your ecu.

Enjoy your free unobstructed exhaust system and possibly some extra hp!

UPDATE FOR K8 600/750 OWNERS - If anyone is looking to do this on their K8 you need to remove the wire in pin #5 and it's the Black wire with a White tracer.

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