Fuel Injectors for 2002–2014 GMC Yukon XL 1500

How long do fuel injectors last in a Yukon XL 1500?

Factory Bosch or Delphi injectors in these trucks typically last 120,000 to 180,000 miles. Flex-fuel models running E85 more than 50% of the time see shorter lifespans—closer to 100,000 miles—because ethanol's corrosive properties accelerate internal seal degradation. If you're still on original injectors past 150,000 miles and seeing any fuel trim drift, plan the replacement soon. The 6.2L Denali engines tend to show issues earlier because higher fuel pressure stresses the pintle valves more than the 5.3L variants.

Can I replace Yukon XL injectors myself or should I take it to a shop?

This is a moderate DIY job if you've pulled an intake manifold before. You'll remove the engine cover, throttle body, and entire plastic intake plenum to access the fuel rail. The injectors pop out with a twist and pull once you release the fuel rail bolts. Budget four hours if it's your first time, two if you've done it. You'll need a fuel line disconnect tool and new o-rings. Torque specs on the fuel rail bolts matter—over-tighten and you'll crack the composite rail. Shops charge 3-4 hours labor, so DIY saves about $350-$450.

What symptoms point specifically to bad injectors versus other fuel system issues?

Start with fuel pressure. These engines need 55-62 PSI at the rail. Low pressure points to the pump or regulator, not injectors. If pressure's good but you're seeing P0171/P0174 lean codes with negative long-term fuel trims below -10%, suspect clogged injectors. Individual cylinder misfires (P0301-P0308) that move when you swap ignition coils point directly to injectors. The dead giveaway is using a mechanic's stethoscope on each injector—you should hear a distinct clicking at idle. No click means it's stuck closed.

Do these trucks have any injector-specific problems I should know about?

The AFM (Active Fuel Management) system on 2007+ models creates a unique issue. When cylinders deactivate under light load, the inactive injectors can gum up from sitting with residual fuel. You'll sometimes see P0300 random misfires right after AFM engages, then they clear when all eight cylinders fire again. Running Top Tier gas helps, but if you're deleting AFM anyway, this problem disappears. Also, the spider fuel rail on these engines uses a composite material that cracks if you over-torque the bolts during reinstall—15 ft-lbs max, not the 20+ you'd use on aluminum.