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Choke does not work
Posted by: 4wd430 ()
Date: December 19, 2017 08:53PM

Hello everyone, hope all is well.

I am trying to figure out why the choke on my '60 does not work. It does not open up as the car warms up. It remains in a fixed position. I changed the thermistor yesterday but same thing. It isn't sticky either as I can easily move it by hand.

Any ideas? Thanks!

60' Corvair Deluxe 4dr

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Re: Choke does not work
Posted by: cnicol ()
Date: December 19, 2017 09:28PM

Is the vacuum system working? Manifold vacuum connects to the choke housing and that vacuum is supposed to draw air from the air cleaner, through the exhaust manifold and up into the choke housing. The hot air from the manifold is what makes the choke open.

Also, on my '60, the choke housing gasket was missing and that put the thermostat into a bind so it wouldn't move.

Just a couple of thoughts...

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: Choke does not work
Posted by: American Mel ()
Date: December 19, 2017 10:32PM

I have never had a "60, but here is a thought.
Isn't there a bi-metal coil inside of that black choke thing?
When it heats up it changes the coilings length which opens the choke.
I would consider that the little coil may be broken, or disconnected.

.
-----------------------------------------------
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

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Re: Choke does not work
Posted by: 4wd430 ()
Date: December 20, 2017 05:35PM

I recently changed the manifold and there is the little pipe there that the comes into the tin and the vacuum line is connected to it from the air cleaner.

60' Corvair Deluxe 4dr

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Re: Choke does not work
Posted by: cnicol ()
Date: December 20, 2017 08:02PM

4wd430 Wrote:
-------------------------------------------------------
> I recently changed the manifold and there is the
> little pipe there that the comes into the tin and
> the vacuum line is connected to it from the air
> cleaner.

Yes, that's the fresh-air intake side of the manifold's choke heat system.

When the engine is running the choke housing should be sucking fresh air through that pipe and into the exhaust manifold. Hot air exiting the manifold is what causes the choke thermostat to open.

See my photo above.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: Choke does not work
Posted by: 4wd430 ()
Date: December 20, 2017 08:21PM

I will do some more investigation tomorrow.

2 things I will look into:

1) The orientation of the throttle leaver assembly and the fast idle cam (from my first picture) seems a little off from the diagram in my shop manual. I will try to get it spot on and see if that makes any difference.

2) I read somewhere that an improper fitting air filter can cause the choke to not work properly. Upon further inspection, the air cleaner in my air cleaner seems to be one that isn't for my 1960 as it does not create a seal with the cover. Rather it seems too small and for another vehicle. I will be ordering the proper one.

60' Corvair Deluxe 4dr



Edited 1 time(s). Last edit at 12/20/2017 08:22PM by 4wd430.

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Re: Choke does not work
Posted by: cnicol ()
Date: December 20, 2017 08:44PM

Re shop manual and throttle lever orientation.

When I put my '60 together (it was a basket case), of course I followed the book to the letter. Here's what happened:

1) The fast idle cam mechanism was so far off it didn't work at all.

2) The choke unloader mechanism was so far off it didn't work at all.

3) The choke thermostat was pinched because there was no gasket under the cover.

4) The vacuum piston (in choke housing) was bound-up and wouldn't crack the choke open after start-up.

I adjusted these things using my knowledge of how these things are supposed to work and found a part number for the gasket, which turned out to be locally available. In the end, the choke worked perfectly but it took some noodling since the book has blind spots.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: Choke does not work
Posted by: richard1 ()
Date: December 21, 2017 08:13AM

Mine had too much dirt inside where the bi-metal spring is. easy to clean up. Then make sure that little tube mentioned previously is installed right, and everything adjusted to that when the spring moves the lever, the lever does something.

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Re: Choke does not work
Posted by: 4wd430 ()
Date: December 21, 2017 03:16PM

In the meanwhile, if I don't get it to work, should I leave the choke locked in the open position permanently, until I can find the issue? Or is it better closed?

Also, I don't seem to get any vacuum from the manifold from the fresh air line, which is very likely one of the issues. The line snapped off from the manifold so I will try and fit it back on and hold it there with some exhaust putty or something.

Thanks!

60' Corvair Deluxe 4dr

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Re: Choke does not work
Posted by: MattNall ()
Date: December 21, 2017 03:37PM

Wire it OPEN / Horizontal...

You need to drill out the old rotten tube from the exhaust manifold and tap in a new one.. steel fuel line is fine.





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Re: Choke does not work
Posted by: 4wd430 ()
Date: December 28, 2017 02:56PM

I took the old line out and used some brake line and inserted it in the manifold where it should be. I also got a vacuum line to connect to the air cleaner. However, I feel no heat or anything through the steel line or the vacuum line at all. So no heat is really be transferred into the air cleaner.

If you look at the picture attached this is what happens:

When I step on gas/hit the throttle:

The red piece moves counterclockwise, then the green piece moves counter clockwise and that makes the choke flap close up.

Thanks!

60' Corvair Deluxe 4dr

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Re: Choke does not work
Posted by: 4wd430 ()
Date: December 29, 2017 04:19PM

Can someone with a '60 please send me a picture of the orientation of the choke from the driver's side (with air cleaner removed) so I can make sure the orientation of mine is the same. I find the service manual to be lacking with this. Let me know if it is while cold or hot.Thanks!

60' Corvair Deluxe 4dr

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Re: Choke does not work
Posted by: steve c goodman ()
Date: December 29, 2017 04:30PM

Have you taken the choke cover off and fiddled with the coil inside? You might check to ensure you have the coil installed so tension is against the shaft. The opening of the throttle should open choke plate (unloader tang) instead of close it.

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo 1965 Crown V8
1967 monza 110/4 1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC

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Re: Choke does not work
Posted by: cnicol ()
Date: December 29, 2017 05:51PM

Here's the fast idle mechanism.

Your comment about the air cleaner hose not providing any heat is correct. That hookup provides clean air to the tube that goes through the exhaust manifold. The manifold provides the heat.

On the right side of the choke bowl, the thermostat (inside the round black puck) reacts to the heat and opens the choke.

Also on the right side is a vacuum system that must be able to draw air up out of the manifold; in other words "suck".

Also on the right side is a vacuum piston that pull the choke plate open a little when the engine starts. That vacuum piston and linkage as to be free and operational.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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