Throttle positioner solenoid question

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Mar 11, 2024 | 03:55 PM

#16

5851a

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Joined: Oct 2006

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From: East Central Ia

Normally the solenoid does not have enough power to open the throttle, but once it is extended it will hold it open.

Nov 25, 2025 | 09:33 AM

#17

Caldwell1980

2nd Gear

Joined: Nov 2025

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Does anyone know where to source a new anti-dieseling solenoid. The one on my truck is missing, I am constantly trying to adjust the idle screw to keep the truck in a happy place where it will idle in gear, it's an automatic, and keep the dieseling to a minimum.

Nov 25, 2025 | 10:05 AM

#18

1TonBasecamp

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Joined: Jul 2017

Posts: 9,601

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From: San Jose, CA

No idea myself. Never had to buy one, because for some amazing reason, all of mine kept working.
Have you tried the usual suspects such as rockauto, or eBay, or Amazon? eBay always seems to have a lot of NOS original parts.

Nov 25, 2025 | 10:08 AM

#19

Caldwell1980

2nd Gear

Joined: Nov 2025

Posts: 2

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I've not had any success, probably would if I knew the part number. It was removed when we bought the truck.

Nov 25, 2025 | 10:42 AM

#20

Rubiranch

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Joined: Jun 2004

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From: South Central Utah

Quote:

Originally Posted by tbear853

I thought it was primarily a anti dieseling deal, but I've read of guys repurposing it to kick up with AC.

My 1979 F-250 with factory AC and a 400 didn't come with a throttle kicker, or idle solenoid.
If I remember correctly they had key on power and were used as a anti-dieseling solenoid.
I don't remember them having enough power to actually kick up the idle speed when the AC was turned on, you had to give it a little throttle for them to kick up the throttle.

I do remember Ford using "VOTM" vacuum operated throttle modulators that were fed vacuum via an electric solenoid that kicked up the idle speed when the AC was turned on. VOTMs didn't need help kicking up the idle speed like the electric solenoids did.

On my 1976 F-250 one of these (my blue wire) comes from the alternator stator and supplies the electric choke thermostat voltage when the engine is running.
The other one (my red wire) is key on power. But then my truck doesn't have AC.