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Unread 12-15-2006, 04:28 AM   #1
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Red face Cold starting misery!

My '72 429 T-Bird runs beautifully when fully warmed up or in warm weather. When winter hits, it won't fast idle good and slobbers around until completely warmed up. I can set the choke rich and the choke pull down so that it will idle without bucking or dying, but if I try to drive away without a long warm up, it will start to stall and if I step on it, it will start to die out and back fire and if I let up on the gas, it will smooth out.
I was advised to clean the exhaust maniford heat valve, but I can't find one. If there is one, I'd like to know where it is located. This happens with the Holley 650 four barrel on the car now or the Motorcraft of the type that came with the car. Both carbs are correctly adjusted. It pulls 21 inches of vacuum at idle and has globs of power. After market pointless ignition and a control box that fire the plugs and extra time each time around. Doesn't seem to be any vacuum leeks. I have fought this problem for the past few years. In all the years my dad drove the car and I maintained it for him, It always started at first crank, fast idled properly and could be driven away cold. The timing is set between 4 to 10 degrees BTDC. Mechanics tell me that I can't go by factory specks because it was designed to run on 102 octane gas when it came out in the late '70s. Niney two is the best I can find nowadays. Could it possibly be the timing?

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Unread 12-15-2006, 11:25 PM   #2
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theres a slight, slight chance its the timing. i know you said that it does it with both carbs, but at first thought, a faulty carb comes to mind. possibly a stuck choke. could also be the egr valve, or it could be the idle air control motor/valve if it has one. i don't know where these parts are located off the top of my head, but a good manual should show you.
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03' Dodge Stratus 2.4L DOHC 150HP, 205/55/16 on 6 spoke painted rims, tinted windows, Infinity sound, upgraded Platinum Champion plugs, 4 speed auto, 2" exhaust.

Top Speed achieved so far: 145
0-70: 9 sec.


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Unread 12-16-2006, 09:21 PM   #3
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Need to know if the 1971 Ford (Thunderbird) 429 C.I.D engine has a heat control valve somewhere in the exhaust manifold to direct warm air to the intake maniford to enable cold weather starts. They used to be in plain sight in previous engines and one could flip it to insure that it was free to move. I can't find a manual for 1971, my local ford dealer doesn't have one and aftermarked books don't give such details. I'm desparate!

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Unread 12-16-2006, 10:36 PM   #4
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can't find any info on a heat valve. if you search the exhaust manifold and can't find anything, than I'd assume there isn't one. other options might be replacing the choke thermostat, choke pull off or very possibly the mixture control solenoid, spark delay valve (deals with timing and spark) other than those parts and the problems they would cause, i can't think of any other possibilities right now.
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03' Dodge Stratus 2.4L DOHC 150HP, 205/55/16 on 6 spoke painted rims, tinted windows, Infinity sound, upgraded Platinum Champion plugs, 4 speed auto, 2" exhaust.

Top Speed achieved so far: 145
0-70: 9 sec.


"I still wish I had my Cavy!" - Me

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Unread 02-01-2007, 12:30 PM   #5
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My Cougar does the same thing.

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