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Run but no idle

Trying to get my 69 911t streetable. I just got a carb synchronizer to balance my webbers. The car will start and run, he'll you can drive it, it just won't idle once you take your foot of the gas. As long as you pump the peddle it will stay running. I have to have it idling to balance the carbs. Where should is start to find out why it won't idle? I've tried turning up the idle screws and the fuel screws on the carb and nothing. This is my first carbed car any help is appreciated.

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1969 911t Targa outlaw in progress
1952 356 coupe project
Old 11-13-2015, 05:18 PM
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Valve adjustment?
Old 11-13-2015, 09:06 PM
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Will valves being out keep it from idling but still let it run? I'm new to porsche engines. Thanks
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1969 911t Targa outlaw in progress
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Old 11-13-2015, 09:08 PM
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My neighbor had the same problem getting his newly acquired 69 911 to idle too. To my surprise, a valve adjustment fixed it.
Old 11-13-2015, 09:12 PM
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Thanks
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Old 11-14-2015, 03:59 AM
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I'd be very surprised by that too!

More likely a carb issue. Essentially your weber has three "circuits" or functions. Idle, Main, and accelerator. From your desrcription, "accelerator" is working. Maybe "main" too since you can drive (though I'm assuming not too well). But "idle" is not.

I'd start by looking at the idle jets. They are very small orifices and easily plugged by dirt and debris in the carbs.

Then I'd check float levels.

Followed by general condition of the carbs. Dirt and corrosion? Particularly he small ports by the butterfly where idle circuit fuel is dispensed.

But, before I looked at anything on the carb, I'd be verifying that ignition was correct. Timing/dwell, and firing order (just in case).

If it don't spark right, it won't run right no matter what the carb does. And, if spark and carb are right, and still no joy, then you have to start considering mechanical condition and internal causes.
Old 11-14-2015, 07:35 AM
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Thanks can the idle jets be cleaned if dirty or do you have to replace them?
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Old 11-14-2015, 07:41 AM
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Daves911L
Holey s***, that was it I pulled the idle jets out ran a jewelers bit through them sprayed some cleaner and walla it fn idled. Carbs still need to be balanced but damn does it idle smooth. Sorry if I'm being overly suprised by this but this is my first time messing with carbs and was a little intimidated by them. I was hoping that they didn't need a full rebuild. Thanks
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Old 11-14-2015, 09:05 AM
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congrats, it is always the simple stuff, now go drive her like you stole her
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Old 11-14-2015, 09:10 AM
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DRACO
That's the plan as son as I get the shifter bushings in.

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Old 11-14-2015, 10:28 AM
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