Where can I find a idle stop solenoid??

Classic industries has it in there catalog although both them and year one think they are discontinued.

I have a 71 340 with TQ.

Thanks

I think Holly, and Edelbrock both have them, but they aren't just like factory. You don't want to see what a oem one goes for.

Yep you want/need a rare one, the DR1114429. These were factory equipment on several Mopars in 1970-71. You, unfortunately, have to compete with Hemi and Six Pack buyers to get a used original one (which can be refurbished/restored) these can cost several hundred dollars used. Generic replacements (same appearance but no number stamped into them) can be purchased for around $100.00 but they do not have the same strength as originals and don't work well.

They originally came on:

1970 340 Six Barrel
1970 440 Six Barrel
1970 426 Hemi
1971 426 Hemi
1971 340 4 Barrel

Hello Scott. I know it sounds like a dumb question but I don't understand it's function. My carbs are from a 70 440 6 pak. The center carb has an idle speed screw on the carb and the solenoid. I don't have the solenoid wired and mine is fine. I don't see how the solenoid can let the idle go lower than the setting of the idle screw on the carb. Thanks

The solenoid is energized when the car is turned on - thus pushing the plunger OUT, against the low idle screw. So when car is running you adjust the idle screw against the solenoid plunger(which is energized and "out"), the solenoid plunger is adjusted so the slow idle speed (when solenoid is de energize, car off) is even lower than when car is running, thus keeping engine from "running on", ensuring the throttle plates are totally closed . . . hope that all makes sense . . .

as this was back in the days of 'good' gas, much higher octane and was to prevent the run-on or 'dieseling'.

Idle stop solenoids were implemented as part of the early steps to reduce HC and CO2. Idle mixes were made leaner, idle timing later which resulted in more heat in the heads and exhaust. As A12 described, when the engine is shut off, the throttle closes off a little more.

Only one flaw in your answer,the throttle plates do not close completely,only to the setting of the idle screw on the carb which should be roughly 200 rpm below speed with solenoid energized.

Yes, that makes sense. So when properly set up it takes the idle speed screw on the carb out of play.

Scott,
Do you have any knowledge about the strength of the Standard MP ES-6? Will it work on a six pack or 4 bbl application?

Thanks
Tom

Years ago Mopar Action did a article on resto 440-6 items and R/Ehrenberg said the ES6 was the one to get since the OE DelcoRemy's were obviously gone. I picked one up New in the box and tested it and it seemed to worked just fine. I never used it and still have it, but bought a few of the repros when they came out, they work too. I guess hearing the repros suck (shocking-not!) just makes me leave them in the box, but I finally found the correct DR1114443 at Carlisle a few years ago, and it works after cleaning it up. I'd use the ES6 before the repros, that is if 443 fails once I get motor running. Never ran one with the mechanical carb set up I had been running on my 440.

Thanks Joe.

Not to get too far off topic, but I've got a #443 and would like to trade for a #429 if anyone's interested.

Ok, a few answers. 62maxwgn pretty much nailed it in how it works.

As far as which replacements will work (on any engine), the ES6 works fine, the only failures/low pressure, etc. I've seen were with the reproductions (thanks China!).

That said, you CAN restore a failing original by swapping the bad internals with internals from another NOS or good original with a different DR# (such as your 443 unit) as long as the male spade is in the same location as the 429.

BTW, you may have a tough time getting someone to swap you for a #443, the 429's generally bring 3-5 times what any other number will.

First pic is an original 429 dissected, second pioc shows a reproduction next to an original.

Wow, I didn't realize alleged difference was that great. #443 is such a more rare part, I figured it would go for more.