One more question. Their is a canister that looks like a vaccumn canister that has a connection for a line. What is it for & what connects to it. This is on the back side of drivers side exhaust. Thanks! Fran
One more question. Their is a canister that looks like a vaccumn canister that has a connection for a line. What is it for & what connects to it. This is on the back side of drivers side exhaust. Thanks! Fran
Pictures? Year? Engine?
Sounds like it might be the vacuum reserve canister. That helps to keep/smooth vacuum at idle. That's because the cam/engine is "lopey" (https://www.corvetteforum.com/forums...ivability.html , https://ls1tech.com/forums/generatio...-ness-cam.html ).
If your car is a 85 GT with the M code engine it’s the vacuum controlled heat riser valve. Used to help speed engine warm up.
From memory, its a vacuum canister called a Heat Valve. Heat VLV
See qikgts Vaccum Emissions Control Info diagram CHB E5AE_9C485 for his 1985 Hi Altitude 4V GT.
Heat VLV.
Its a normally open canister which controls the exhaust diversion to the primary light off catalyst.
boboli photoed it, its the item on the top of the picture that looks like a waste gate actuator.
http://vb.foureyedpride.com/showthre...1985-Emissions
http://vb.foureyedpride.com/showthre...-exhaust/page2
The earlier 83 and 84's with 4-bbl carbs (not the CFi's) had no tubing headers, and had another kind of secondary heat stove which blocked off one side of the exhaust to pre-heat the primary light off oxidation catalyst.
Its some times called a flapper valve too. The 85's have a bigger 2.75" one, not the earlier 2.375".
http://vb.foureyedpride.com/showthre...23#post1656823
Last edited by xctasy; 02-07-2019 at 10:44 AM.
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