That critter is your turbo switchover valve. Mine was defective, and the PO by passed the switchover and directly connected the line from the banjo bolt to the alda by using some rubber hose. You are not supposed to do that. That is not a vacuum connection. The ALDA receives pressure from the turbo, and adjusts the fuel levels in the IP accordingly. Bypassing the valve can cause over fueling, which is a destructive thing.

Either clean or replace that valve. The way to test it is this, if you have it out of the car and the wires disconnected, you should be able to blow through it, If not, it's a goner. Replacement is of a different style, so do not worry difference in appearance.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 TD Turbo, chipped. Still needs EGR Delete, 228K

90 Dodge D250 5.9 Cummins/5 speed. 400K