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DW SD DW SD is offline
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Join Date: May 2004
Location: Encinitas (San Diego CA)
Posts: 4,495
3.2L Carrera, 964, 993 all drive tach signal from the ECU. It would be surprising that 959 does not.

Is there head temperature sensor? Maybe it thinks the engine is warmed up? Not sure that would explain the ICV valve opening at speed.

Is there a chance the ICV is wired backwards?
1971 RSR - interpretation
Old 11-28-2007, 07:55 AM
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