GM Authority has received a growing number of emails and messages from General Motors pickup truck and SUV owners experiencing valve lifter problems.
Some of these owners are stating that their vehicle has been at the dealership for several weeks while waiting on repairs. The valve lifter issues seem to concern the naturally aspirated 5.3L V8 L84 gasoline engine and the naturally aspirated 6.2L V8 L87 gasoline engines, which can be found in 2019-and-later model year Chevy Silverado 1500 and GMC Sierra 1500 pickups, as well as 2021-model-year full-size GM SUVs, including the Cadillac Escalade, Chevy Suburban, Chevy Tahoe, and GMC Yukon.
To note, the naturally aspirated 5.3L V8 L84 is rated at 355 horsepower at 5,600 rpm and 383 pound-feet of torque at 4,100 rpm, while the naturally aspirated 6.2 V8 L87 gasoline engine is rated at 420 horsepower at 5,600 rpm and 460 pound-feet of torque at 4,100 rpm.
Repairs for the V8 engine valve lifter issues are currently being performed under warranty.
The uptick in complaints from GM Authority readers regarding valve lifter issues follows a service bulletin issued in September of 2020 addressing valve spring issues in newer 6.2L V8 engines, including the L87, LT1, LT2, and LT4. The service bulletin states that certain GM V8 engines may produce a service engine light, along with a misfire and peculiar engine noise, which is the result of faulty valve springs. The bulletin instructs technicians to check for a broken valve spring and, if necessary, perform a cylinder leakage test. For other GM V8 engines, including the L82, L84, and L8T, technicians are instructed to replace the affected valve spring, and if there is a cylinder leak, perform further inspection to determine the extent of the engine damage.
A report from GM TechLink also indicates that GM pickups and SUVs equipped with either the L84 or L87 could experience a “misfire condition with a bent pushrod that leads to a collapsed lifter or the lifter comes apart.”
GM Authority will follow this story closely and report back any further updates as we receive them.