Fuel Injectors for 2000–2004 Chevrolet Silverado 2500

How long do fuel injectors last in a 2000-2004 Silverado 2500 6.0L?

Expect 100,000-140,000 miles on the original Multec 2 injectors. Trucks that tow heavy or idle a lot see failures closer to 90,000 miles. Ethanol gas accelerates varnish buildup. If you're past 120,000 and noticing stumbles or lean codes, you're on borrowed time. Replace all eight at once—mixing old and new creates uneven fueling that triggers more codes.

Can I replace Silverado 2500 6.0L injectors myself or should I pay a shop?

Straightforward DIY if you've done spark plugs. The LQ4 has decent valve cover clearance. You'll need a fuel line disconnect tool and a torque wrench for the fuel rail bolts—37 ft-lbs. Depressurize the system first by pulling the fuel pump fuse and cranking the engine. Budget two hours for all eight injectors. Shops charge $400-600 labor on top of parts. The hardest part is not stripping the Torx bolts on the coil brackets.

What are the main symptoms of bad injectors on the LQ4 6.0L V8?

Hard starting when cold is the first clue—the engine cranks forever before catching. You'll get a rough idle that smooths out once the engine warms up. P0171 or P0174 lean codes appear because clogged injectors can't deliver enough fuel. Under light throttle between 1,500-2,500 RPM the truck bucks or surges. Sometimes you'll smell raw gas if an injector seal is leaking. Check fuel trims with a scanner—if long-term trims are above +15%, injectors are restricted.

Do 6.0L Silverados have any injector-related quirks I should know about?

The LQ4 is prone to intake manifold gasket leaks around 100,000 miles. A vacuum leak there mimics lean codes just like bad injectors. Spray brake cleaner around the intake-to-head mating surface—if idle changes, fix that gasket first before blaming injectors. Also, the fuel pressure regulator on the rail can fail and cause low pressure, making good injectors look bad. Confirm you're holding 55-62 PSI at idle before replacing injectors.