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Idle Valve is the 2 wire Bosch IAC motor. I have been doing some research on the 2 wire units.
Some units remain open until power is applied, then they only open 25%. This would explains
the slow increase in rpm from 650 to 1000 rpm. I am going to try unplugging the IAC tonight.
I understand there is an adjuster screw, to adjust the voltage going to the IAC.
Not sure if mine has this or not. My tuning software does not allow for this adjustment.
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1988 Porsche 930 Targa - 3.4L Twin Plug Motor, DC 13 Cams, Supertec Head Studs, ARP Rod Bolts, Port and Polished Heads, Garretson Andial Intercooler, GSX 61 BB Stage 5Turbo, Tial F46 WG .8 Bar Spring, PowerHaus Headers, Rarly8 Dual Tip Muffler, MS3 Pro EFI conversion, 85lbs. Injectors, Center Force Stage 2 Clutch , Rebuilt 4 Speed with LSD.
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