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12-04-2012, 02:10 PM
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CC Member
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Join Date: Dec 2011
Location: Voorhees,
NJ
Cobra Make, Engine: BDR #1230/B2 445CI SBF
Posts: 295
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Not Ranked
Carb problem-I think????
I am experiencing what seems to be a flooding issue. Dead cold start everything is fine-1 pump, choke closes, warms up, touch gas and idles perfect. If I go to start the car after it has warmed up and then sits for a short time it wont start and if I give it gas it sputters and white smoke bellows from the carb. The only way I can get it started at this point is to hold it wide open and play with it, once it starts it runs great.
I checked the float sight glasses, fuel is just above the bottom of the glass. No visible fuel leaking when I look into the carb after I shut it off.
Any ideas? Thx
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Gary Bowman
Voorhees NJ/Key Largo Fla/Ventnor NJ
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12-04-2012, 02:13 PM
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Senior Club Cobra Member
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Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
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sound like the choke is closing on you after it's warmed up,causing flooding, when you hold the pedal down, you open the butterflies and let more air in to compensate for the closed choke...........try dis-connecting the choke for a few days and see what happens...........
David
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DAVID GAGNARD
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12-04-2012, 02:18 PM
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CC Member
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Join Date: Dec 2011
Location: Voorhees,
NJ
Cobra Make, Engine: BDR #1230/B2 445CI SBF
Posts: 295
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Dave-when I took the air cleaner off (after not being able to start it) the choke was open, I thought for sure the choke was closed too.
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Gary Bowman
Voorhees NJ/Key Largo Fla/Ventnor NJ
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12-04-2012, 02:26 PM
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Senior Club Cobra Member
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Join Date: Jan 1999
Location: MARKSVILLE,LA.,,
Posts: 3,235
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Quote:
Originally Posted by GBowman
Dave-when I took the air cleaner off (after not being able to start it) the choke was open, I thought for sure the choke was closed too.
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I'm sure it is in the open position when you looked into the carb, but when you turn on the key,especially if it's an electric choke,it may close and you'll never know it.........to eleminate the choke as the problem, just dis-connect it and try it,quick/easy and free.........
David
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DAVID GAGNARD
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12-04-2012, 02:49 PM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
Vapor lock. The fuel in the bowls may be boiling after sitting with the hood closed and the engine hot. Try opening the hood or a phenolic spacer between carb and manifold.
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Jim
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12-04-2012, 02:53 PM
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CC Member
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Join Date: Dec 2011
Location: Voorhees,
NJ
Cobra Make, Engine: BDR #1230/B2 445CI SBF
Posts: 295
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OK-wired the choke open and disconnected hot wire too. Keep my fingers crossed, thx.
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Gary Bowman
Voorhees NJ/Key Largo Fla/Ventnor NJ
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12-04-2012, 03:26 PM
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CC Member
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Join Date: Apr 2008
Location: Melbourne,
Vic
Cobra Make, Engine: Some polish thing... With some old engine
Posts: 2,286
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heat soaked fuel.
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12-04-2012, 06:42 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Lower the floats until fuel is at the BOTTOM of the window while idling. Fuel is probably dripping out of the boosters or accelerator pump jets after setting for several minutes. If you want to check: after shutdown carefully force part of a paper towel carefully past the booster and above the throttle butterfly. Remove it later with a set of needle nose pliers or fish it out with wire. Check it for saturation of fuel.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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12-05-2012, 03:27 AM
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CC Member
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Join Date: May 2008
Location: San Jose CA,
CA
Cobra Make, Engine: SPF_R_/BRG/FRBoss302/327CI/FordEFI/Under_Car_Exh/
Posts: 2,523
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Parker has a good trick - just got to remember to pull the towel.
This could also be a venting issue on the tank pushing gass to the carb after shutdown. Again sounds like flood -
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Steve SPF 2734 MK3 / Brock Coupe #54- panavia.com
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12-05-2012, 03:53 AM
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CC Member
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Join Date: May 2008
Location: Brisbane,
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Cobra Make, Engine:
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Do you have a mechanical fuel pump?
Chances are the fuel is percolating in the fuel bowls, the fuel pressure in the line after pump will then keep feeding the carb with hot fuel and flood the engine.
Hot restart difficulty is the result.
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Gary
Gold Certified Holden Technician
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12-05-2012, 06:22 AM
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CC Member
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Join Date: May 2009
Location: American Fork,
Ut
Cobra Make, Engine: 66 Cobra
Posts: 930
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After the engine is warm, before you start it again look at the sight plugs and determine if the fuel level has dropped. If it has then fuel is leaking into the manifold. It could be gaskets or a leaky power valve. If you pull the carb also check for loose or missing screws on the bottom of the throttle plate to main body.
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Wayne
"Everything is alive. If you get angry at a vehicle or the trans, it won't fix until you apologize and say you are sorry." "The vehicle always knows what it is doing and what the cause of it's bad feeling is. If you ask it humbly what the problem is, it will tell you. Then you and it will both be happy."
Gil Younger
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12-05-2012, 04:47 PM
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CC Member
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Join Date: Jul 2009
Location: Westerly,
RI
Cobra Make, Engine: Fordstroker 408w custom solid roller-Craft ported Brodix 17*heads-CFM ported Vic Jr. intake-1 3/4 primaries- 575hp-TKO-600RR Liberty upgrade- -Moser 8.8 trutrac-McLeod Street Extreme--QA-1-Wilwood brakes, Classic Chambered 3" Cobrapacks, Avon's
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Gaz64 has it right. You said if the car sits for a short time it is difficult to start. I'll bet if it sits for more than a short time it will start right up. That would be after the excess fuel evaporates in the runners and plenum.
If the above is the situation you will need to find a way to keep the carb cooler and or the fuel.
A plastic or wood spacer
Reroute the fuel line or get if away/off of hot spots
Turkey pan
Electric fuel pump with a return line
Lower fuel in bowl like what was said (keep it in the sight glass)
Lou
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Lou
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