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> Cold start valve, Bypass it?
Ian Stott
post Jun 21 2015, 05:15 AM
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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
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Spoke
post Jun 21 2015, 06:31 AM
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The cold start valve operates only below freezing (0C). Once the case temperature is above freezing, the cold start valve is not active.
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SLITS
post Jun 21 2015, 06:52 AM
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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.
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VegasRacer
post Jun 21 2015, 07:03 AM
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QUOTE(SLITS @ Jun 21 2015, 05:52 AM) *

On my /6 they are disabled also.

Never had a problem starting in cold weather.


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Tom_T
post Jun 21 2015, 04:35 PM
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QUOTE(Spoke @ Jun 21 2015, 05:31 AM) *

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


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! (IMG:style_emoticons/default/biggrin.gif)

.

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/

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r_towle
post Jun 21 2015, 05:16 PM
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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..
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Ian Stott
post Jun 22 2015, 02:42 AM
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Can you just unplug the electrical connection and plug the fuel line or does the fuel have to be returned somewhere?

Ian Stott
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r_towle
post Jun 22 2015, 05:52 AM
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Just unplug the electrics and the fuel line...simple.
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mepstein
post Jun 22 2015, 09:40 AM
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Cold start valve isn't working right
Replace the ECU
WTF?
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Ian Stott
post Jun 23 2015, 05:51 PM
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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
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