Fuel Injectors for 1996–2018 GMC Savana 3500

How long do injectors last in a Savana 3500 work van?

Figure 120,000 to 160,000 miles in typical commercial service. Vans that idle a lot—contractors running power tools, delivery routes with constant stops—kill injectors faster. E85 flex-fuel models see shorter life because ethanol degrades O-rings and internal seals. If you're towing near max GVWR regularly, heat cycles shorten lifespan. Change fuel filters every 30,000 miles and you'll push toward the higher end of that range.

Can I replace Savana injectors myself or does this need a shop?

The 4.8L and 6.0L have injectors under the intake plenum. You're pulling the doghouse cover inside the van, then removing the entire upper intake manifold. It's a half-day job with basic hand tools. The fuel rail bolts are torque-critical—35 ft-lbs, no more. Use new O-rings and lubricate them with clean engine oil before installation. Depressurize the fuel system first or you'll spray gasoline everywhere. Doable at home if you're comfortable with intake work.

What codes indicate injector failure on these Vortec V8 engines?

P0300 random misfire is the first warning. Then you'll see P0171 and P0174 system too lean on both banks as injectors start clogging. Specific cylinder misfire codes—P0301 through P0308—point to individual injectors. P0201 through P0208 are injector circuit codes, usually meaning a failed coil inside the injector body. Pull fuel trims with a scanner. If long-term trims are above +15%, injectors aren't delivering enough fuel and the ECM is compensating.

Do Savana 3500 injectors have any specific failure pattern I should know?

Yes. The rear cylinders—numbers 7 and 8 on the driver side, 2 and 4 on passenger—run hotter because they're farthest from the radiator. Injectors in those positions fail first. You'll often see P0307, P0308, P0302, or P0304 before the front cylinders act up. Also, if you've got a check-engine light and the van runs worse after sitting overnight, that's classic leaking injector O-rings. Fuel drains into the intake while parked and floods cylinders on startup.