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Jamie911

911 Stalls when cold

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My 77 911S Targa 3.2L keeps stalling until it's warmed up for a few minutes. Could this be the cold start valve? If so where is this valve located?

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Could be many faults causing this issue. The cold start injector is only operational for a very short time so I would first start with verifing the fuel pressure and then test the intake system for vacuum leaks. If you're not familiar with CIS system I highly recommend finding a garage that has experience with your vehicle as it will save you endless hours of agro.

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I did a little reading up on the CIS system and it does sound like this could be something hard to pin point. One thing I should add is if I start the car and give it a little gas to bring the idle up it will keep running. If I do that for a couple of minutes it will idle on it's own. With that said if it is cold outside and I try to drive it too soon it will stall the first time I bring the car to a stop. After that it runs fine. Also runs fine when the weather is warm.

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CIS is very sensitive to vacuum leak so start by having the intake system smoke tested,repair any leaks,clean the air flow meter,throttle body and cold air by-pass valve then retest the system. A word of warning, a lean backfire can destroy the air box if you don't have a pop off valve installed.

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My 77 911S Targa 3.2L keeps stalling until it's warmed up for a few minutes. Could this be the cold start valve? If so where is this valve located?

You need to perform a pressure check on the system.Look closely at the control pressure cold. I think the graph is posted on this forum,if not let me know. You should also check for unmetered air leaks.

Howard

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