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Carb electrical issues
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WOFTAM
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PostPosted: Sat Mar 09, 2019 1:51 am    Post subject: Carb electrical issues Reply with quote

I've got a 1600 with a 30PICT-1 carburettor fitted to my '59 panelvan. It's an Australian made Solex if that makes a difference.

I was chasing a sticky throttle issue which I've sorted, but while checking that out I noticed that my bus wouldn't idle without the accelerator cable attached. It appears that the carburettor is grounding through the accelerator cable. Presumably it's not running without the accelerator cable going to ground as the idle shutoff solenoid won't then work normally. If I run a jump wire from the carburettor to the body, it will idle fine.

Is that behaviour normal or is there something going on with my carb wiring?

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anthracitedub
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PostPosted: Sat Mar 09, 2019 5:39 am    Post subject: Re: Carb electrical issues Reply with quote

Interesting.... seems the carb is completely isolated from ground. That pilot valve needs + and - to work. Might try cleaning the area where the mounting stud/nut tighten down on the flange to see if it can ground through there.

Makes me wonder about how well your engine/trans ground strap is too. At least inspect/clean that as well.

Another thing I noticed, the terminal for your pilot solenoid is right on the alternator body... I know you have the insulated connector there, but that doesnít sit well with me. If it wears through, youíll have a direct short. Maybe a thin spacer for the carb to give it a little room? Maybe itís perspective, one pic looks really close.
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Krochus
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PostPosted: Sat Mar 09, 2019 6:05 am    Post subject: Re: Carb electrical issues Reply with quote

You need a carb spacer to run this combo with an alternator. Your accelerator pump is probably only partially operational as well due to it hitting the alternator

Then the choke and the idle fuel cutoff solenoid both need to see 12v+ switched with the ignition
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Dale M.
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PostPosted: Sat Mar 09, 2019 8:05 am    Post subject: Re: Carb electrical issues Reply with quote

Ditto on carb spacer and yes to 12V DC to both choke stove and solenoid, usually supplied off positive (+) terminal of ignition coil....

Dale
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Cusser
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PostPosted: Sat Mar 09, 2019 8:50 am    Post subject: Re: Carb electrical issues Reply with quote

All of the above. And it would be OK to run a ground wire from a carb screw up on top to engine ground; or even to body ground as long as you allow slack to allow for engine "movement".
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PostPosted: Sat Mar 09, 2019 9:27 am    Post subject: Re: Carb electrical issues Reply with quote

'67 bus had a tall "governor" under the carb, IIRC. No luck finding a pic of one, but it might function in a pinch.
You could also try a spacer similar to this, which is actually an adapter:

Image may have been reduced in size. Click image to view fullscreen.


Also check for a short right where I've circled in red, it appears to be in direct contact per both pics above:

Image may have been reduced in size. Click image to view fullscreen.

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mikedjames
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PostPosted: Sat Mar 09, 2019 1:36 pm    Post subject: Re: Carb electrical issues Reply with quote

You realise the sticking throttle spindle will not have been helped by having an electric current flow from the carb body to the spindle and then to the throttle cable.
It will be producing arcs which melt the metal and either erode it or cause friction.. check the spindle bushings for wear.
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WOFTAM
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PostPosted: Sat Mar 09, 2019 3:59 pm    Post subject: Re: Carb electrical issues Reply with quote

Thanks for the tips.

The wire to the shutoff solenoid is well clear of the alternator body. I double checked and itís the perspective of the photo. The accelerator pump is also clear of the alternator. It operates away from the alternator.

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Still doesnít explain why itís grounding through the accelerator cable... I thought it would have gone to ground through the manifold and engine.
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earthquake
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PostPosted: Sat Mar 09, 2019 7:57 pm    Post subject: Re: Carb electrical issues Reply with quote

Do you have a ground strap to your transaxle? rubber mounts on trans may be isolate ground from chassis.

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WOFTAM
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PostPosted: Sun Mar 10, 2019 12:27 am    Post subject: Re: Carb electrical issues Reply with quote

earthquake wrote:
Do you have a ground strap to your transaxle? rubber mounts on trans may be isolate ground from chassis.

Casey


Yes, itís got the braided strap on the transaxle. Iíve had that off and cleaned the contact surfaces just in case that was an issuue.

The engine itself appears to be grounded. If I run a jump wire from the carb to another part of the engine, it idles fine. Itís as if the carb is not electrically connected to the engine.
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Q-Dog
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PostPosted: Sun Mar 10, 2019 5:46 am    Post subject: Re: Carb electrical issues Reply with quote

My guess is the paint on the manifold may be preventing a good ground.
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