"But Nate, wouldn't the EGR delete prevent the butterfly valve from closing at all through the custom programming?"
That's what I'm hoping. I plan to ask the chiptuner in person at a future TDI Fest!
Yea, my throttle plate somehow fell out of the intake, right about the same time my EGR pipe got mysteriously blocked with some foreign object
Where I drive, there is HEAVY traffic and I do lots of idling (stuck in traffic, but can't turn the motor off because traffic inches forward within a minute or less), creeping and light load operation. This type of driving causes the highest exhaust recirculation flow rates in a TDI. Not good at all!
I just don't like the idea of not having the throttle plate to choke off the air when the key is turned off. You could conceiveably loose an engine because of it. I think my clutch is beginning to slip some too. A run-away engine and a slipping clutch are a recipeit for disaster!
I've been studying the wiring diagram for the throttle plate motor and I plan on trying to figure out how ti apply power to the correct terminals to get it to shut fully and then open when the power is turned off. The plate/motor is spring loaded, so if the system failes in operation, the plate stays open to prevent the engine from stalling, a potentially dangerous situation on the road. I may be to work this to an advantage. Plate stays open w/ no power applied and with 12V to the correct terminals, the plate closes. You could just hit the "closed" switch you install on the dashboard to close the plate and kill the motor, if a "runaway" occurrs. The 12 volts would be supplied even when the key is "Off". Then, after the engine stops, you just flip the switch "open"
With normal operation, the throttle plate closes when the key is turned off (for a quiet engine shut down) and then opens a few seconds later, ready for the next enguine start. I want to figure out how that works too.
And, under normal operation, with the engine running, the throttle plate is locked open (you can not push it closed with your fingers), but if you unplug the electrical connector to the throttle plate motor, you can manually close the plate against its spring tension, I belive. Let go of the plate, it springs back open.
--Nate