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71 stock won't stay at idle
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mjhale
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PostPosted: Sun Mar 19, 2017 3:08 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

She starts but idles rough still. Where should the idle speed adjusting screw be to start carb adjustment?

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Danwvw
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PostPosted: Sun Mar 19, 2017 4:13 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

Back the throttle stop off all the way then turn it in just enough that the throttle butterfly just begins to open. It needs to rest in the closed position on the adjuster screw not the butterfly.
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mjhale
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PostPosted: Mon Mar 20, 2017 3:14 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

I'm not getting the carb to cooperate. Suggestions for rebuilding carb?
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Danwvw
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PostPosted: Mon Mar 20, 2017 8:24 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

How much play is in the throttle shaft?
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mjhale
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PostPosted: Mon Mar 20, 2017 9:14 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

Throttle feels fine
With key on, the battery reads 12.24 v but coil, idle and choke solenoid on carb is 10.45 v.
Thanks for your help
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Danwvw
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PostPosted: Mon Mar 20, 2017 9:31 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

It's normal to loose 1 volt between the battery and there on the coil or the carb. 2 volts loss could be due to several things. The Ignition switch is suspect and the connection at the Generator's regulator if going through there could be the connection at the battery or a ground connection to the battery.
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Jody '71
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PostPosted: Tue Mar 21, 2017 8:37 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

Make sure your timing is correct for '71 Bus with the stock SVDA distributor and the 34-3 Carb. What do you have the timing set at right now??

Per Bentley, chapter 5,"Engine and Clutch." page 72, Table 1 Ignition Timing, with both distb. hoses connected and NOT removed or plugged, timing should be set at 5 degrees after (not before) TDC at curb idle of 800-900 rpms. There is a note on page 73 regarding checking the function of the advance of the SVDA distributor for the '71. So, if you have a degree wheel pulley, anything after TDC will be to the left of the TDC mark on your pulley. I think I got that right.....others may correct me if I'm wrong.

If you don't have the green Bentley manual you really need to get one.
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ccpalmer
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PostPosted: Yesterday 5:25 am    Post subject: Re: 71 stock won't stay at idle Reply with quote

mjhale wrote:
I'm not getting the carb to cooperate. Suggestions for rebuilding carb?


This is the way to go. I highly recommend it.

http://www.volkzbitz.com/
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TomWesty
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PostPosted: Yesterday 5:45 am    Post subject: Re: 71 stock won't stay at idle Reply with quote

Since it's a '71, the first thing I think of when I encounter a no idle situation is the brake vacuum system. Any leak there will cause it to not idle. The best way to test it is to remove the vac hose from the intake manifold and plug the hole in the manifold with a rubber stopper or such. If it now idles, your leak is upstream of the manifold. Could be the hose to the servo or the servo itself. Remember though, you now have lost your assist to the brakes so it takes a lot of leg force to stop the bus.
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lil-jinx
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PostPosted: Yesterday 7:02 am    Post subject: Re: 71 stock won't stay at idle Reply with quote

The fuel filter should be on the suction side of the pump,it is a weak point in the system and may not stand up to the fuel pressure from the pump.
I just read thru those 2 pages,you make it hard for anyone to help you,some very good people are making suggestions on how to proceed,you need to do the tests and report the results,you said it's now running rough as opposed to not running,what did you do to make it run.If you don't tell the whole story everything else is just a guess.bus daddy asked some very pertinent questions a the start which you still have not answered.
Goodluck;Nelson
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