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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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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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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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PostPosted: Thu Mar 23, 2017 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: Thu Mar 23, 2017 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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PostPosted: Thu Mar 23, 2017 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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mjhale
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PostPosted: Sat Mar 25, 2017 2:11 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

I've got spark, fuel, and compression but she still runs like crap. Valves are adjusted and timing is set.
On carb adjustment...I screwed in the mixture and speed screws and then backed them both out 2.5 times. I warm up the engine and set the throttle valve stop screw as directed in Bentley.
After I start the bus...
How much should I need to turn the mixture screw? Which direction?

Thanks for your help!
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busdaddy
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PostPosted: Sat Mar 25, 2017 2:25 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

mjhale wrote:

How much should I need to turn the mixture screw? Which direction?

You need to turn it as much as it needs in the direction that works Wink

2.5 is a good starting spot and it obviously works because it sort of runs, now you need to tune it for the best mixture.

With it all warmed up and the choke off turn that small mixture screw in 1/2 turn, does it run faster?, or slow down?, if it runs faster keep going, if it slows back up and go the other direction. The objective here is to find the happy spot where it idles the fastest, then turn it in so the idle drops ~50 RPM, if you don't have to smog you can leave it at best idle, but it will use more gas and fowl the plugs when idling long periods.

Once you find that happy spot adjust the final speed with the bigger screw.
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PostPosted: Sat Mar 25, 2017 7:10 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

When you do turn that screw the 1/2 turn,give it a few seconds to react.
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mjhale
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PostPosted: Sun Mar 26, 2017 6:59 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

She is running great.
Thank you all that replied.
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Jody '71
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PostPosted: Sun Mar 26, 2017 8:15 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

So after all of this exhaustive back and forth with your posts and our replies, what did you do finally to achieve your end result???
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PostPosted: Mon Mar 27, 2017 10:56 am    Post subject: Re: 71 stock won't stay at idle Reply with quote

Jody '71 wrote:
So after all of this exhaustive back and forth with your posts and our replies, what did you do finally to achieve your end result???

Yes, please let us know what worked to fix your bus.
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mjhale
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PostPosted: Mon Mar 27, 2017 3:37 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

I had gone through compression, fuel, and spark tests. The last bit to get her running smoothly was I had to adjust carbs and adjust positioning of the distributor.
I still have voltage loss at coil but will get to that asap. Also, fuel line is fine.

Thanks

Hope that helps
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PostPosted: Mon Mar 27, 2017 3:48 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

mjhale wrote:
adjust positioning of the distributor.

Please tell us just how you did that.
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PostPosted: Mon Mar 27, 2017 4:15 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

Adjusting the distributor,timing,most be done properly,if your fuel mixture is off,say lean,and you adjust timing to compensate you may be {read are}setting the seeds of destruction for your engine,
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mjhale
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PostPosted: Mon Mar 27, 2017 9:01 pm    Post subject: Re: 71 stock won't stay at idle Reply with quote

I followed Bentleys directions on timings and adjusting distributor.
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