Does the cold start valve just matter when engine is cold? When engine is warmed up could you bypass the cold start valve with no issues?

Ian Stott
Moncton
Canada

The cold start valve operates only below freezing (0C). Once the case temperature is above freezing, the cold start valve is not active.

I have more than once disabled the cold start valve on /4s.

On my /6 they are disabled also.

Never had a problem starting in cold weather.

Jerry - I think it actually cuts in a bit above freezing from my experience here in SoCal.

BTW - it's now time to update your avatar pic to Bucs or Steelers logos!

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Ian - the ECU should be automatically cutting out the CSV when the engine is warmed up enough. It's only supposed to boost the fuel/air mixture when needed - just like the hand throttle on the 914-6s & early non-EFI 911s.

If it's not doing so, then you've got something up with your ECU, & I suggest you get FIC/BRET in Tracy/Livermore CA or someone competent to rebuild it or sell you a rebuilt on core exchange. BRET used to be in Torrance/SoCal, but were bought by FIC & moved up north years ago. My 73 2.0's ECU was cored out to BRET in the late 70's/early 80's & had run fine for another 5-7+ years after that.

https://www.fuelinjectioncorp.com/

Cheers!
Tom
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The ECu is most likely not the issue, so don't rush into a waste of money.

These injectors get stuck open and dribble fuel all the time, making the super rich mixture hard to diagnose.

I removed mine north of Boston, near and issue.
I also don't drive it in the super cold months, but for now, just unplug the electrics and remove the fuel line..

Can you just unplug the electrical connection and plug the fuel line or does the fuel have to be returned somewhere?

Ian Stott
Moncton
Canada

Just unplug the electrics and the fuel line...simple.

Cold start valve isn't working right
Replace the ECU
WTF?

Cold start valve electrical unhooked, fuel line disconnected and plugged with a bolt and clamped, no leaks! When setting the timing in a 2056 with pertronix do you have any upgrades to the distributor?


Ian Stott
Moncton
Canada