Air By-Pass Valve, with Plunger, for 34 PICT Solex

OVERVIEW

The EMPI Air By-Pass Valve, specifically engineered for the 34 PICT-3 Solex carburetor, is a critical component for any air-cooled enthusiast looking to maintain a smooth, reliable idle and prevent the dreaded "run-on" or dieseling effect. Often referred to as the idle shut-off solenoid, this valve is responsible for opening the idle circuit when the ignition is switched on. When you turn your key to the "on" position, an internal electromagnetic coil retracts the plunger, allowing air and fuel to flow through the idle circuit. Without a functioning valve, your engine will likely stall the moment you let off the accelerator, making stop-and-go driving an absolute nightmare for your vintage Volkswagen. This high-quality replacement ensures that your fuel system operates exactly as the engineers in Wolfsburg intended, providing the precise control necessary for modern driving conditions.

Engineered to meet or exceed original equipment specifications, this EMPI unit (Part Number 98-1297-B) is a direct replacement for the often-failed factory solenoids found on late-model Type 1 and Type 14 engines. Over decades of use, the internal copper windings in original valves can break down due to heat and vibration, or the plunger can become gummed up with modern ethanol-blended fuels. Replacing a faulty or sticking valve is one of the most cost-effective ways to restore drivability to your Bug or Ghia. This unit features a robust housing and a precision-ground plunger to ensure a perfect seal every time the ignition is killed, instantly cutting off the fuel supply to the idle port and ensuring your engine stops exactly when you want it to. Don''t let a tiny electrical component ruin your weekend cruise; upgrade to a fresh by-pass valve and enjoy the peace of mind that comes with a perfectly tuned idle circuit.

FITMENT

This air by-pass valve is designed specifically for 12-volt systems utilizing the Solex 34 PICT series carburetors. It is a direct fit for the following models:

• Volkswagen Beetle (Standard): 1971, 1972, 1973, 1974
• Volkswagen Super Beetle: 1971, 1972, 1973, 1974
• Volkswagen Karmann Ghia: 1971, 1972, 1973, 1974
• Replacement Carburetors: Fits most Bocar, Brosol, and EMPI 34 PICT-3 replacement carburetors.

SPECS

Every EMPI component is built to exacting standards to ensure longevity in the harsh environment of an air-cooled engine bay. Technical specifications include:

• Brand: EMPI
• Part Number: 98-1297-B
• OEM Reference: 049-129-412C
• Operating Voltage: 12 Volts DC
• Terminal Type: Male Spade (Standard VW push-on connector)
• Body Material: Zinc-plated corrosion-resistant steel
• Internal Componentry: High-temp copper solenoid windings with spring-loaded plunger
• Thread Diameter: Standard Solex idle circuit metric threading

PRO TIPS

Tip 1: The Audible Click Diagnostic

Before you start tearing your carburetor apart, perform the "Click Test." With the engine off, turn your ignition key to the "on" position (do not start the engine). Go to the back of the car and pull the wire off the by-pass valve, then touch it back onto the terminal. You should hear a distinct, sharp metallic "click" every time the wire makes contact. This is the plunger retracting. If you don''t hear a click, check for 12V power at the wire with a test light. If you have power but no click, the solenoid is dead and needs replacement. If you hear a dull "thud" instead of a click, the plunger may be gummed up with old fuel varnish and is struggling to move.

Tip 2: Proper Wiring Daisy-Chain

In a stock VW configuration, the air by-pass valve is usually wired in a "daisy-chain" with the automatic choke element. Ensure that your connections are tight and free of corrosion. If the wire to your choke is loose, it can cause the by-pass valve to lose power intermittently, leading to random stalling at stoplights. We recommend using a high-quality insulated female spade connector and ensuring the wire is tucked away from the throttle linkage to prevent mechanical interference or short-circuiting against the carburetor body.

Tip 3: Don''t Over-Tighten During Installation

When installing your new EMPI by-pass valve, remember that the carburetor body is made of relatively soft cast alloy. It is vital that you do not over-torque the valve. Thread it in by hand first to ensure you aren''t cross-threading it into the carburetor. Once it is finger-tight, use a wrench to give it just enough of a turn to snug it down against the sealing surface. Over-tightening can distort the carburetor housing or snap the threaded portion of the valve, leading to a permanent vacuum leak that is difficult to repair. Always ensure the plunger is clean and dry before sliding it into the carburetor port.