a vacuum leak will also cause it to idle erraticly. get all new vacuum lines. have you read the article on tuning weber 32/36 in the tech section.
DAVE

Oh ... very important.

Make sure the distributor vacuum advance hose is connected to the "ported" source on the carb -- not to "full vacuum". At idle, there should by NO vacuum on the distributor.

To be safe when checking idle, disconnect and plug the vacuum advance hose. Set your timing, idle speed and mixture, then reconnect. The engine speed should not change with the vacuum advance connected at idle. If it does it is either connected to the wrong port on the carb OR the diaphragm on the distributor is bad (leaking air).

I would not take the intake manifold off. Instead, test it ... the Carb article explains how to do this using WD40 (spray lubricant).

The timing can be checked with the engine OFF (not running). Check any Datsun repair manual for the intial timing procedure.

So, I should check on the vacuum leak first. While I am at it, should I just replace the intake manifold gasket by taking the manifold off?

How can I adjust the timing properly if the base idle is too fast when warm?

Sounds good, perhaps a vaccum leak, check the carburator bolts, make sure you properly installed it, cris cross adjustment on the four carb mount bolts, in little increments,make sure all necesary vaccum ports are connected or covered, check the intake manifold for proper adjustment, check for leaks. Check the timming, because, I remember when I installed mine, I started the car and it went high on the RPM, and later found out it was completely advanced.
Jaime.
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I really doubt the jets are causing it to idle so fast:

1. The curb idling circuit does not depend on the jets in practice, but uses the needle valve (mixture screw) to regulate fuel flow.

2. If it's running too rich at idle, it should idle slow! not fast.

In other words, way-fast idle is an AIR problem, not a FUEL problem.

I used the L16 jets on my A12, an it idle/ran just fine. It ran slightly better after playing with the jets.

nelam, check out the basics. If the throttle plates are closing all the way (stick a flashlight down the carb to tell), you probably have a vacuum leak. The Tech Section article might help ... carb work mainly needs careful attention to small details. Carb adjustment, troubleshooting, rebuild and inspection

It is a new unit from a VW shop who specialized in Bugs. I thought the bug's engine displacement is almost the same as my L16's, so I went ahead and bought it.

What should I do? Replace the jets to a smaller size? Which jet do I need to change? And what is the proper jet size for my 73 L16.

Thanks

Quote:Sounds like the fast idle screw needs adjustment (to start with). That should bring down the cold-idle from 3000 rpm down to 1800 or so, or whatever you feel comfortable with.

The warm-idle 1200 is high as well, but remember, the "recommendation" is just to get the thing started. Then you play with the idle speed screw, idle mixture screw and fast-idle.

Also make sure the secondary throttle butterfly is closing all the way, it might not be right from the factory.

Is this a brand-new carb, or a remanufactured/rebuilt/second-hand one?

Hy. When I got my 32/36 Weber, I followed the instructions on the card that comes with the carburator and it worked fine. Check your timing(distributor, I ignore how your previous carb condition was, but it could be that it was so bad that the timming was , or had to be ,far from optimum set up for the car to idle.)...also you mention a VW, could it be that you got a carburator jet set for a VW instead? Check that out.Each Weber 32/36 comes with a number, the number indicates the jet kit for a specific car, or else you will have to change the jets yourself,not difficult but better to know where your ground is. The emmulsion tubes are also a cosideration if gotten the wrong( 32/36 weber not made for your L engine, jet wise, although correctable)... carburator. It is the same Weber 32/36 for everyone, but the jets(main ,iddle,air, secondary, primary.) differ for the application.
Jaime ________________________

Hi everyone,
I just installed a new Weber 32/36 DFEV to my 73 620 w/the original L16. I got the carb. from a VW shop. I replaced the fuel pump, fuel filter, NGK spark plugs, points and condenser, good plug wires, good distributor cap and rotor, and fresh motor oil and filter. I also serviced the cooling system. So everything is fresh. However, I am having problem of tuning this carb.

On the base idle setting, Weber recommends 2 to 2.5 turn out for the mixture screw, and 1 to 1.5 turn for the speed screw. But if I tune my carb. according to this setting my idle speed will be around 3k rpm. The setting I am using is 1 turn out for the mixture screw and zero turn on the speed screw, and my idle is around 1200rpm when fully warmed and this is the most smooth setting.

But the engine just will not idle after a cold start. I got all the electric choke stuff hooked up correctly and I know for sure that the choke is closed when the engine is cold and opens when hot.

In order for it to run, I have to sit there and play with the throttle to make it stays running. After it warms up, then the engine will idle at 1200rpm.

So I pulled the spark plugs out and confirmed that the engine is running rich.

Does that mean I have to change the jets to a smaller size? What else can I do?

Any input will be greatly appreciated. Sorry for the long post.
Nelson