[tirwin]

WyattEarp,

Just want to confirm something to make sure we’re on the same page. You’re describing hard/no starting when the engine is cold, right? I’m just asking because I’m wondering why you’re repeating the fuel pressures test. No harm, and it shows consistency. Just trying to understand the logic. Understand the fuel pressures might not be perfect but the cold control pressure can be near zero (really, really rich) and the car will still start.

Your condition is crank, no fire. So likely culprits would be fuel starved, air starved or weak ignition. I’ve never tried it myself on a 911 but what about a little starting fluid? If it fires up that’s pointing back to fuel starved.

Fuel related: If TTS is ok, then you have to check CSV. Check the plug to make sure it’s connected. Can you verify it’s getting 12v when cranking? That would rule out wiring problem to CSV.

Spark related: I’d pull the coil wire and check for spark quality.

Air related: Once you get the car running you say it runs fine. If you remove the oil filler cap does idle change? It should. If not you have a decent vac leak somewhere. Maybe not the root cause but probably not helping. AAV provides a little extra burp of air on start. AAR is designed to be open on cold start and closed when warm. If it was stuck closed on a cold start that would be a problem. Only way I could see that happening is if it seized.

I’m just trying to frame up how I would be starting to formulate a plan of attack to the problem.

My next stop would be the CSV.