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Gmc C15/C1500 Pickup Carburetor Idle Stop Solenoids

Gmc C15/C1500 Pickup Carburetor idle stop solenoids

Starting at $99.95, AutoBuffy stocks 1 carburetor idle stop solenoids from Standard Ignition. This small electric valve holds the throttle plate open at the correct idle position when the ignition is on, then snaps it shut when you turn the key off to prevent dieseling. A failed solenoid causes rough idle, stalling, or run-on after shutdown.

Signs your Gmc C15/C1500 Pickup needs a new carburetor idle stop solenoid

  • Engine continues to run or 'diesel' after the ignition is turned off
  • Idle speed drops noticeably lower than normal or hunts up and down
  • Engine stalls repeatedly at stop signs or in slow traffic
  • Idle quality worsens when the A/C compressor engages and load increases
  • Solenoid plunger visibly stuck extended or retracted with no movement when powered
  • Check engine or emissions-related warning light triggered by a lean or unstable idle condition

Which carburetor idle stop solenoid should you buy for your Gmc C15/C1500 Pickup?

The most important factor is matching the solenoid to the exact carburetor model and voltage configuration on your Gmc C15/C1500 Pickup, since connector type, plunger length, and thread pitch vary by application. OE-replacement units restore stock idle control precisely, while universal solenoids require adjustment and are better suited for rebuilt or non-original carburetors.

OE Direct-Fit Replacement
Best for
Restoring factory idle control on a stock carburetor
What you get
Matched connector, correct plunger travel, bolt-in installation with no adjustment needed
Universal Adjustable Solenoid
Best for
Rebuilt carburetors or custom setups where original specs are unknown
What you get
Adjustable plunger length and open-thread body; requires bench setting before install
Heavy-Duty / High-Current Unit
Best for
Vehicles with upgraded A/C or high electrical load that causes idle drop
What you get
Stronger electromagnet holds throttle more firmly under accessory load
Remanufactured OE Solenoid
Best for
Budget-conscious restorers who want OE fitment at lower cost
What you get
Core-exchange unit rebuilt to original specs; may include updated internals for durability

Carburetor idle stop solenoids brands we stock for your Gmc C15/C1500 Pickup

Standard Ignition
1 option · from $99.95

Replacing the carburetor idle stop solenoid on a Gmc C15/C1500 Pickup

Easy⏱ 30–60 minutesFlathead and Phillips screwdriversSmall open-end or adjustable wrenchNeedle-nose pliers12V test light or multimeterTachometer or OBD tach readout for idle adjustment

Disconnect the electrical connector, unscrew the solenoid body from the carburetor mounting boss, and thread the new unit in until snug — avoid overtightening the brass or aluminum body. Reconnect the wiring, start the engine, and adjust the plunger stop screw to restore the correct idle speed with all accessories active. Always recheck idle after the engine reaches full operating temperature.

Frequently asked questions

How much does it cost to replace carburetor idle stop solenoids on a Gmc C15/C1500 Pickup?
Parts start at $99.95 on AutoBuffy. The solenoid itself is inexpensive, and most DIYers complete the job in under an hour with basic hand tools. If you pay a shop, expect one to two hours of labor on top of the part cost, making this one of the more affordable carburetor repairs.
What exactly does a carburetor idle stop solenoid do on a Gmc C15/C1500 Pickup?
When the ignition is on, the solenoid extends its plunger to prop the throttle plate at the correct idle opening. The moment you shut the engine off, the solenoid de-energizes and retracts, closing the throttle completely. This starves the engine of air and fuel instantly, preventing run-on or dieseling after shutdown.
Can I drive my Gmc C15/C1500 Pickup with a bad carburetor idle stop solenoid?
You can drive short distances, but expect a rough or low idle and possible stalling at stops. The bigger risk is run-on after shutdown, where the engine keeps firing uncontrolled and can cause knock or overheating. Replacing the solenoid promptly is inexpensive and eliminates those risks before they cause secondary engine damage.
How do I test a carburetor idle stop solenoid on a Gmc C15/C1500 Pickup?
Unplug the solenoid connector and apply 12 volts directly from a test light or jumper wire. The plunger should extend fully and hold firm. Remove power and it should retract. If the plunger doesn't move, moves sluggishly, or buzzes without extending, the solenoid has failed and needs replacement.
Will a carburetor idle stop solenoid affect fuel economy on a Gmc C15/C1500 Pickup?
A stuck-open solenoid raises idle speed slightly, which wastes a small amount of fuel at every stop. A stuck-closed solenoid causes low idle and stalling, often prompting drivers to blip the throttle to compensate, which also hurts economy. A properly functioning solenoid keeps idle fuel delivery consistent and efficient.
How do I set the idle speed after replacing the carburetor idle stop solenoid on my Gmc C15/C1500 Pickup?
With the engine at operating temperature and all accessories on, adjust the solenoid's external stop screw until idle speed matches the specification on your vehicle's emissions decal. Then verify the throttle plate closes fully when the solenoid is de-energized. Refer to the carburetor service manual for the exact procedure for your carburetor model.

Shop carburetor idle stop solenoids by year for the Gmc C15/C1500 Pickup

197419731972197119701969

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