I’m a few days behind the curve on another unfortunate mechanical issue that’s been affecting new C8 Corvette owners. Like the previous recall for a brake sensor issue that affected six GM vehicles, the problem regarding V8 valve springs isn’t just limited to new Corvettes as everything from Camaro to Silverado to the Chevy Express Van is affected.
If your 2020 Corvette was built between June 1st to September 15th, keep reading…
The service bulletin TSB PIP5752A was issued after GM has identified a bad batch of valve springs that have been used across GM’s V8 line-up that includes the L87, LT1, LT2, LT4, L82, L84, and L8T engines. Owners with a bad valve spring may experience a check engine light along with the engine misfiring and making other strange noises.
For the LT87, LT1, LT2, and LT4 engines, technicians are instructed to replace the faulty valve spring and also perform a cylinder leakage test on the affected cylinder. The bulletin adds that “if no cylinder leakage is observed it will be necessary to replace all valve springs on both banks if the vehicle is built between June 1, 2020 to September 15, 2020.”
On the L82, L84 and L8T engines, dealer technicians are required to replace the faulty valve spring only.
The service bulletin also asks technicians to return all valve springs to Detroit for inspection.
#PIP5752A: Service Engine Light misfire engine noise With DTC P0300 P0106 P0506 – (Sep 22, 2020)
Service Engine Light misfire engine noise With DTC P0300 P0106 P0506
Involved Region or Country:
A Vehicle may have a concern of service engine light, misfire and engine noise with possible of DTC P0300 P0106 P0506.
Possible broken valve spring
During inspection if you determine that the engine has a broken valve spring it will be necessary to perform a cylinder leakage test on the affected cylinder.
If no cylinder leakage is observed it will be necessary to replace all valve springs on both banks if the vehicle is built between June 1, 2020 to September 15, 2020. Note: This only applies to the 6.2L engines RPOs L87, LT1, LT4 and LT2. For all other engine RPOs L82, L84 and L8T just replace the affected valve spring.
If you determine that engine has cylinder leakage it will be necessary to inspect further to determine the extent of the engine damage to determine correct repair required.
All valve springs will be requested back for further analysis and inspection.
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