GM 6.2L V8 EcoTec3 Direct Fuel Injector 12668390 - Silverado / Sierra 1500

Overview

A direct fuel injector referenced to OEM 12668390 for 2014-2018 GM 1500 applications. Supplied as a replacement direct fuel injector for the GM L87 6.2L EcoTec3 V8 and the closely related Gen V 6.2L applications noted below. This listing covers the component described here only; hardware such as bolts, seals and gaskets is included only where the specification list says so.

Function

A direct fuel injector meters fuel into the combustion chamber at high pressure, so its spray pattern and flow rate set both emissions and driveability. A clogged or leaking injector typically produces a single-cylinder misfire, a strong fuel smell at idle, black smoke, elevated fuel trims on one bank, or a cold-start stumble that clears as the engine warms.

Specifications as documented

• Component: Direct fuel injector
• OEM part number: 12668390
• Cross-reference: FJ121 series reference appears in the truncated title
• Engine: 5.3L stated in title; 6.2L Gen V flagged in listing match
• Model years: 2014-2018 (supplier stated)
• Package contents: 1 x injector per piece (seals not confirmed as included)

Compatibility

Engine: 5.3L stated in title; 6.2L Gen V flagged in listing match. Vehicle applications recorded for this part: Chevrolet and GMC 1500 applications, 2014-2018 as stated by supplier. Model years: 2014-2018 (supplier stated). OEM reference: 12668390. Fitment status recorded at the time of listing: oem number listed for 5.3l by supplier - 6.2l / l87 fitment unconfirmed.

Installation

Injectors are matched to their cylinder by flow, so replacing one on a high-mileage engine is best done as a matched set. Fit a new combustion seal and O-ring for every injector, lubricate seals as specified, keep the seat clean, and torque the retaining hardware correctly. Clear fuel trim adaptations and confirm the misfire has gone before release.

Fitment notice

Compatibility is stated for the GM L87 6.2L EcoTec3 V8 on the strength of the supplier listing and, where an OEM number is published, a parts-catalogue cross-check. GM built the 6.2L V8 in several forms, and L86, LT1, LT2 and LT4 components are not automatically interchangeable with L87 parts. Before ordering, confirm the engine RPO code and the original part number against the vehicle, and treat this listing as a guide rather than a substitute for that check. Specialist engine repairs should be carried out by a qualified technician.