× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Re: GM 5.3 setting P0521
Posted to Technical Discussion Forum on 7/29/2019 3 Replies

[Blown gasket]

Reach under the TB and see if the bolts are loose for the VLOM. Often find them less than hand tight without external leakage. Cycle AFM cylinders and note oil pressure changes. Photo above shows blown out seals. Most aren't that bad but will... Login to read more.

Files Referenced:

thumbnail

3 Replies Received (View Replies)