Buy OEM 1990 Gmc Part # 12600462. Engine Timing Chain Guide. Timing Chain - Repair or Replace Your engine's timing chain can stretch over time resulting in a check engine

Guide. Chain. Timing.
2nd Design. Guide for the Timing Chain. Idler to Cam. Assembly -. Engine. Shoe.

Engine Timing Chain Guide

Timing Chain - Repair or Replace
Your engine's timing chain can stretch over time resulting in a check engine light that comes along with excessive noise from your engine's timing cover. If the chain has broken, which is a rare occurrence, the engine will not start. If your 1990 GMC has high mileage along with any of these other symptoms, contact our service department for expert diagnosis.