Fuel Injectors for 2003–2014 GMC Savana 1500

How long do fuel injectors last in a GMC Savana 1500 with the 5.3L V8?

Expect 120,000 to 180,000 miles from the factory injectors in these vans. High-idle service life cuts that short—delivery vans and contractors who leave them running drop closer to 100,000 miles. The LM7 engines from 2003-2006 seem to go slightly longer than the later LC9 and LMG variants. Flex-fuel models don't show shorter injector life despite ethanol use. If you're past 140,000 and seeing lean codes, plan for replacement soon.

Can I replace Savana 1500 injectors myself or should I take it to a shop?

This is a manageable driveway job if you've changed spark plugs before. The 5.3L V8 has decent access to the fuel rail. You'll need a fuel pressure release procedure, 10mm and 13mm sockets, and injector pullers. Budget four hours for all eight if you're methodical. The valve covers don't need removal. Biggest hassle is the intake duct and possibly the alternator on the passenger side depending on year. If you've never worked on fuel systems, a shop avoids the fire risk from spilled gas.

What are the most common symptoms of bad injectors in the Savana 1500 5.3L?

You'll get P0171 and P0174 together when multiple injectors lose flow capacity. Single-cylinder misfires point to one dead injector—verify by swapping it to another cylinder and seeing if the code follows. Rough idle under load is classic, especially when the van is full of cargo or towing. Some guys report a stumble right around 40 mph during gentle acceleration. Black smoke means an injector is stuck open and dumping fuel. Check for oil in the injector harness connectors first—it mimics injector failure.

Do these vans have any specific injector-related problems?

The 2007-2014 models with the LC9 and LMG engines had a harness design flaw where the injector wiring chafes against the valve cover. Oil seeps into the connector and shorts the signal. Looks exactly like a failed injector until you pull the connector and see green corrosion and oil residue. Also, these vans idle constantly in commercial service. That builds carbon on the injector pintles faster than a truck that gets highway miles. Run a quality fuel system cleaner every 5,000 miles if you do lots of city or idle time.