The Duramax engine injectors were a source of concern during the early years of this engine design.  The LB7 Engine (Eighth digit of VIN will be a 1) built between 2001 and 2004 are equipped with injectors designed and built by Bosch and are prone to failure, but are covered by General Motors Warranty for a period of 7 years or  320 ,000 KMs.

Typical symptoms of a failed fuel injector can be hard starting or no starting, low engine power  or the the check engine light on.  Failure can cause fuel to leak into the engine and dilute the oil, so if you suspect a problem, do not drive it for long.  These symptoms can be caused by high fuel return rates due to fuel injector body cracks, ball seat erosion, or high pressure seal extrusion.

Our customers have expressed difficulty getting GM to cover these injectors as they sometimes fail in ways that the warranty does not cover.  Patience and persistence may work for you when attempting to get coverage, but don’t be surprised if you are not successful.

Precision Auto Service can accurately pinpoint fuel injector failure and source you new or rebuilt injectors that are updated to prevent further trouble.  Call us at 604-530-9394 to discuss your fuel injector concerns.

Duramax LB7 Injector