[Walt Fricke]

Tony
You may recall that my '82 US replacement engine (purchased from someone in Seattle and shipped to me in Boulder in maybe 1990) had the 089. I think Charles mistakes the air vent for a vacuum port (the hose just allows the upper chamber of the WUR to connect to the filtered air which is above the throttle body).

This ran just great, at least before I started adjusting the WCP to try to get race air/fuel readings at high track RPMs. Eventually, a shop redid the engine and replaced with an 090 just because that is the parts book part for the model. Ran great with it, too.

Eventually, all I could figure was that the specs for the 090 for these small port US SCs might not be the right specs for an 089. The 090 presupposes the Lambda system and its controls of the CP, and doesn't need any altitude/barometric compensation other than what the Lambda provides.

But I don't believe it is just coincidence that two engines of reasonably well known provenance have the same "wrong" WUR. Anyone else seen this on these models? And up until recently, his engine ran fine with the "wrong" WUR. And still does, other than this starting issue. Maybe our Porsches are like our bodies - some of us have our heart on the right side, not the usual left? Still work just as well.

However, I'd put my $ here on an issue with the cold start system. If not the sensor (which is pretty easy to check), then maybe the plug issue.