× 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: VW GTI intermittent loss of crankcase vacuum
Posted to Technical Discussion Forum on 1/13/2021

Excess carbon buildup on the back of the intake valves is common if this is a GDI style engine. Intake valves get very sticky and the vacuum will give strange readings.

Just for diagnostic test purposes, get a bottle of sea foam additive and a section of vac... Login to read more.