 Cold start valve, Bypass it? |
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| Ian Stott |
 Jun 21 2015, 05:15 AM
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#1
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Senior Member  Group: Members Posts: 907 Joined: 28-January 08 From: Moncton/Canada Member No.: 8,635 Region Association: Canada  |
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 |
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| Spoke |
Jun 21 2015, 06:31 AM
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#2
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Jerry Group: Members Posts: 7,153 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None 
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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 |
Jun 21 2015, 06:52 AM
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#3
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
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 |
Jun 21 2015, 07:03 AM
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#4
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ELVIRA Group: Benefactors Posts: 8,751 Joined: 27-March 03 From: Between Scylla and Charybdis Member No.: 481 Region Association: None
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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. (IMG:style_emoticons/default/agree.gif) |
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| Tom_T |
Jun 21 2015, 04:35 PM
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#5
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TMI.... Group: Members Posts: 8,321 Joined: 19-March 09 From: Orange, CA Member No.: 10,181 Region Association: Southern California
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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/ Cheers! (IMG:style_emoticons/default/beerchug.gif) Tom /////// |
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| r_towle |
Jun 21 2015, 05:16 PM
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#6
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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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 |
Jun 22 2015, 02:42 AM
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#7
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Senior Member Group: Members Posts: 907 Joined: 28-January 08 From: Moncton/Canada Member No.: 8,635 Region Association: Canada |
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 |
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| r_towle |
Jun 22 2015, 05:52 AM
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#8
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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Just unplug the electrics and the fuel line...simple.
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| mepstein |
Jun 22 2015, 09:40 AM
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#9
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914-6 GT in waiting Group: Members Posts: 19,845 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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Cold start valve isn't working right
Replace the ECU WTF? |
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| Ian Stott |
Jun 23 2015, 05:51 PM
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#10
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Senior Member Group: Members Posts: 907 Joined: 28-January 08 From: Moncton/Canada Member No.: 8,635 Region Association: Canada |
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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