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Sunroof Sunroof is offline
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Join Date: Feb 2001
Location: South of the Mason-Dixon Line
Posts: 3,722
Thanks. Unfortunately I do not have the fuel pressure testing equipment to evaluate my fuel pressures. CIS has always been a pain in the butt and having the first unit in a Porsche 911 does not make it any easier. My model does not have a thermotime switch, air pump and a unique WUR that cannot be adjusted.

According to the CIS Trouble Shooting Guide for a symptom of: Irregular Idle With Warm Engine,
I have to investigate a leaking cold start valve, air leak, sensor plate movement, injector leakage, warm pressure control and maybe the plunger on the fuel distributor getting stuck.

Much to look at and explore.
Old 03-21-2018, 10:20 AM
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