Karlyn 331 Spark Plug Wire Set

Karlyn-STI 331 Spark Plug Wire Set

The Karlyn 331 spark plug wire set is an OE-style ignition wire replacement built with black insulation and OEM boot type details. It is listed for Volvo 740, 760, 780, and 940 applications with a 22 in. coil lead and use with SAE type spark plugs.

Key Features

• OE boot type for factory-style fitment
• Black wire set for a clean engine bay appearance
• OEM engine application listing
• 22 in. coil lead noted in fitment
• Use with SAE type spark plugs
• Fits Volvo 740, 760, 780, and 940 applications

Product Details

Karlyn-STI is the product line designation for this ignition wire set, indicating an OE-focused replacement option within the Karlyn catalog. Part number 331 is specified for select Volvo 740, 760, 780, and 940 models, including 1988-1992 Volvo 740, 1988-1990 Volvo 760, 1989-1991 Volvo 780, and 1991 and 1993-1995 Volvo 940 configurations. The fitment notes call out a 22 in. coil lead, SAE type spark plugs, and The Shell application detail, making this a direct-reference choice for owners servicing the ignition system on these vehicles.

This part cross-references no listed interchange numbers in the provided data.

Common Issues It May Address

• Misfires caused by worn or deteriorated plug wires
• Hard starting related to weak ignition transfer
• Rough idle from inconsistent spark delivery
• Engine hesitation under load
• Voltage leakage from aging insulation

Installation Notes and Tips

• Verify engine configuration and coil lead length before installation.
• Match the wire routing to the original layout to avoid crossfire and heat exposure.
• Confirm the vehicle uses SAE type spark plugs as listed in the fitment notes.
• Inspect distributor cap, rotor, and spark plugs during service for best ignition system results.

Quality Assurance

This Karlyn-STI ignition wire set is built to OE-style specifications for the listed Volvo applications and uses OEM boot type construction with black insulation for a factory-oriented replacement.