Tahoe V8s from 2000 through 2017 share a problem. The injectors leak or clog between 120,000 and 180,000 miles. Doesn't matter if you've got the workhorse 5.3L Vortec (LM7, LC9, LMG, L83 engine codes), the hybrid 6.0L (LFA), the older 4.8L, or the later flex-fuel 6.2L (L9H). They all use similar Multec 2 or Gen IV multi-hole injectors that eventually fail. You'll notice it first on cold starts. Engine stumbles, runs choppy for thirty seconds, then smooths out. Or you get a flashing check engine light under load—misfire codes P0300 through P0308. Sometimes it's just one cylinder cutting out (P0171 lean code on one bank, P0174 on the other). Flex-fuel models running E85 see this faster because ethanol is harder on seals. These trucks use batch-fire or sequential injection depending on year. Earlier models (2000-2006) tend to fail from pintle clogging. Later ones (2007-2017) fail from coil resistance drift or O-ring leaks at the fuel rail. We stock 263 injector options covering every Tahoe engine configuration in this span. Most are direct-fit with connectors that match your harness.
Expect 120,000 to 160,000 miles on the 5.3L and 6.2L engines. The 4.8L sometimes goes 180,000 because it runs less boost and sees less heat. Flex-fuel models running high ethanol blends (E85) typically fail earlier—around 100,000 miles—because alcohol degrades the internal seals faster. Hybrid 6.0L injectors last about the same as the 5.3L. Towing heavy loads regularly shortens lifespan by 20,000-30,000 miles due to sustained high fuel demand and heat cycling.
Yes, if you're comfortable pulling the intake plenum. The 5.3L and 4.8L require removing the throttle body and fuel rails—about three hours for someone with basic tools. The 6.0L hybrid has more wiring to disconnect but follows the same process. The 6.2L in 2015-2017 models has direct injection plus port injectors; you're only replacing the port injectors in most cases, which is straightforward.Depressurize the fuel system first. You'll need new O-rings and a torque wrench for the fuel rail bolts (89 in-lb).
Coils cause sharp misfires that worsen under load and throw cylinder-specific codes (P0301-P0308). Injectors cause lean codes (P0171/P0174) plus misfires, often with rough idle that smooths out once warmed up. If you smell fuel or see black smoke, it's injectors. Swap the coil to another cylinder—if the misfire code follows, it's the coil. If the code stays on the same cylinder, check injector resistance (12-16 ohms on these engines). You can also swap injectors between banks to confirm.
The Gen IV Vortec 5.3L (LC9, LMG codes) in those years runs higher fuel pressure (58 PSI) than earlier models and uses Active Fuel Management (cylinder deactivation). AFM cycles injectors on and off constantly, which wears the pintle seats. Carbon builds up on the intake valves because these are port-injected engines—no fuel wash on the valves. That carbon breaks loose and clogs injector screens. TSB 10-06-01-008K addresses this. Many techs disable AFM when replacing injectors to extend the new set's life.