Chevrolet Colorado Kept Losing Cylinders and Blowing Injector Fuses

When a Simple Breakdown Turns Into a Frustrating Repair Most of us have been there – your reliable car suddenly breaks down, you pay for repairs, but the problem just won’t go away. You try another shop and hope for the best, but the issue sticks around. That’s the kind of trouble this Chevrolet Colorado owner had. Equipped with GM’s 2.8-liter Duramax diesel , the truck had an intermittent electrical fault that repeatedly blew its injector fuse. When this happened, the engine lost two cylinders, shook heavily, and eventually shut down. Two repair shops had already attempted to fix it by replacing the fuse, but neither found the underlying cause. The owner eventually brought the truck from Arizona to Dave’s Auto for another diagnosis. Finding the Fault and Getting the Truck Running Again DQ, the technician, studied wiring diagrams, checked injector resistance, and watched the amperage during test drives. Still, the problem was hard to catch. Finally, moving the wires near the firewall made the injector fuse blow right away. That was all the clue needed. A closer look showed the harness had been rubbing against the low-pressure AC line for a long time, slowly wearing through the insulation on two wires: one for the injectors and one for the fan clutch signal. DQ patched up the wounded wires, beefed up the harness, and wrapped it all in extra protection – no cab removal needed. A test drive and a few strategic wiggles later, the fix held strong. No more blown fuses, and the Colorado was back in fighting shape. Dave's Auto Center/YouTube What Other Vehicle Owners Can Learn From This Let this Colorado’s ordeal be a lesson: swapping a blown fuse is just a Band-Aid if you don’t hunt down the real culprit. If a fuse keeps blowing, it’s time to dig into the circuit instead of just tossing in another one. Here, it wasn’t a bad injector or some catastrophic engine failure . Just a couple of wires, slowly worn down by rubbing against a neighbor. If your own ride starts acting up like this, get a pro to check the wiring, connectors, and anything nearby – especially where harnesses snake past pipes or brackets. Chasing down these sneaky faults takes patience, but finding the real issue saves you from endless headaches and wasted cash. Dave's Auto Center/YouTube