Please don't post in the FAQ section, that area is reserved for commonly asked questions.
On most vehicles, the PCV valve allows crankcase vapors and moisture to be sucked into the intake manifold and burned during the normal combustion cycle. I won't go into much detail, but a quick Google search brought this website.
Keep in mind that 7M equipped vehicles do not use a traditional PCV valve
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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