By the looks of it it screws into the intake manifold as most manifolds used 3/8" NPT for water jacket ports. Interchange shows TVS EGR vacuum switch used on C10 PICKUP (1976 - 1986) and has thread Size - NPT: 3/8" - 18. Thermostats housing are available from FOUR SEASONS # 84899 and have two ports - 1/2" and 3/8" NPT which is perfect for TVS switches!Īs for EGR TVS the best closest equivalent I can find is GM OE# 373510, AC-Delco 21232, SMP PVS27. The thermostat housing is available from most auto parts stores new (AL casting) and much nicer to work with. Yep, been there - do not like that 70's smog crud! This is the level of technology they had back in the 70's before EFI came to the rescue! As long as you have everything connected you should be fine during smog check. EFE valves are also known to rust through and cause chattering noise when the spot welds that hold a flapper to the shaft break. In grand scheme of things EFE valve is forced closed when engine coolant is below a set point (TVS set point) and forces exhaust gases from passenger side exhaust through the intake manifold passage heating engine faster during cold start. However, if your TVS EFE switch screws into into thermostat housing and has NPT 1/2-14 threads a 1979 to 84 service replacement would probably work OK. You should start a new thread with your question and post detailed info regarding your truck. Thnanks, this is the last piece I need to complete a new smog system for a CA truck Does anyone know the OEM part number or can direct me to the correct part of the EFE TVS? I think it it also known as the vacuum switch, the one off the truck that broke off ws blue in color and basically just snapped off in my hand when i touched it.
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