[WyattEarp]

I'm new to working on CIS and have done a bunch of reading. Did the fuel pressure tests with results below. Symptoms after.

1983 911 SC with 105k miles stock motor
WUR 090

4.7 bar System Pressure

Ambient air 67 degrees
1.0 bar Cold Pressure
1.25 bar @ 1 minute
2 bar @ 1:30
2.75 bar at 2:00
3 bar at 2:30
3.5 bar at 3:00 and holds steady there

1.7 bar 10:00 residual pressure and holds for over an hour

Problem is the car is either extremely hard to start or won't start when ambient air is less than about 70 degrees. When it gets into the 50s it usually wont start cold. It will crank and crank and sometimes sputter just a bit as I let off the key. Crank too much and smell fuel. If it does finally catch and run it will idle a little low for about 30 seconds. If I give it some revs it runs just fine. After running for a minute or so the car runs excellent. Revs great, idles great and then comes back to idle great. Once its been running even for as little as say 30 seconds if I turn it off it will immediately fire back up and run well at first turn of the key. All of this goes away if the ambient air is in the mid 70s and above with the exception of maybe a bit of a low idle when first started.

So looking at the charts in my Bentley it looks like system pressure is within spec of 4.5-5.2 bar. Residual Pressure is good being over 1.1 bar. Control Pressure warm is within spec of 3.4-3.8 bar. So looks like the problem is the cold pressree. Looking at the graph it says I should be at about 2-2.4 bar.

So where do I go from here knowing I have low cold pressure? What do I need to do to get it to start when its cold and cold outside?