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I have a '69 L78/TH400 and am in need of a idle stop solenoid and bracket. This is for a Holley. Does anyone have an idea where I may be able to find this part? What esle interchanges is any? All help is appreciated.
 

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I think these solenoids were put on to close the throttle plate even more when you turned the key off. That way, the car would not 'run on' or diesel after the key is off. I'm not sure, but if your car shuts off fine without it, maybe you don't need it.
 

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I think you're looking for the solenoid that bumps up the idle in AC cars when the AC is on. If your car does not have working AC, you don't need it. If it does have working AC, you may have to set the idle a little higher so the car won't stall at idle when the AC kicks on.

Update: Daves7dnova is correct -- the idle stop solenoid is to completely kill the car and prevent run-on. AC cars have a solenoid, too, but it's to bump the idle, not kill it.
 

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Idle Solenoid..

This is indeed a rare part....they were used on the 69 L78 and L72 TH400 applications. The hi horse motors tended to run at a higher idle and this solenoid prevented dieseling (run-on) when the car was shut off. Most of these switches have been tossed over the years because of carb changes and performance upgrades. I am not sure if the low horse engines also had one with the automatic or perhaps with a/c....you might want to contact Eric Jackson form Vintage Musclecarparts and see if he has one or can help. Your best chance to find one may be thru the Camaro guys.

I have attached a photo

www.vintagemusclecarparts.com

wilma
 

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Discussion Starter #6
Thank you very much for this information and picture. I am in the process of trying to track this part down now. If anyone comes across one before I do, please contact me. Thanks again.
 

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I think you're looking for the solenoid that bumps up the idle in AC cars when the AC is on. If your car does not have working AC, you don't need it. If it does have working AC, you may have to set the idle a little higher so the car won't stall at idle when the AC kicks on.

Update: Daves7dnova is correct -- the idle stop solenoid is to completely kill the car and prevent run-on. AC cars have a solenoid, too, but it's to bump the idle, not kill it.
An L78 car would not have A/C.
 

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If you don't mind repro, then...your best bet is probably:

Check out Classic Industries Nova or Camaro Catalog, toll free 800-854-1280
www.classicindustries.com:yes:

Replacement unit manufactured by Holley:
Holley Throttle Solenoid H4674 - $84.95
Holley Throttle Solenoid Bracket #H209 - $14.95
Nut #H2657 - $$5.95

If you want NOS, then Google it.:rolleyes:

Gary (69camaro)
 

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I have a 69 that I believe was an L34 car originally. Manual transmission, manual steering, etc. There is a large number 8 or 10 wire 9 (purple?red?) that has been cut off the wire harness under the hood near the wiper motor. I think I looked at a wiring schematic once that indicated that this wire was for the idle solenoid. Does that sound right for an L34 car???
 

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contact M&H electric, and they can tell which nova came with the wire for this solinoid. they have the factory blueprints and cantell you if only L78 cars had it or L34 A/C cars had it too...:D
 
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