Marksan Posted March 7, 2021 Share Posted March 7, 2021 (edited) ..................... Edited April 6, 2021 by Marksan (see edit history) Link to comment Share on other sites More sharing options...
NC1968Riviera Posted March 7, 2021 Share Posted March 7, 2021 Temperature sensor? Link to comment Share on other sites More sharing options...
drummerboy Posted March 7, 2021 Share Posted March 7, 2021 Not sure what that is, however you can access the 71 Service Manual here: http://www.buick-riviera.com/ Just scroll down the menu on the left to the "Restoration" section and you will see it there. Then you can open the section you need. Link to comment Share on other sites More sharing options...
JZRIV Posted March 8, 2021 Share Posted March 8, 2021 At first I did not recognize the part because the vacuum nipple is broken off the top but Rivman contacted me and figured out its the TVS/TCS sensor. You need to reference a 72 manual if you have a 72 as I believe the 72 varied a bit in the design of the TCS system vs 71 which was the first year for this messy attempt to control emissions. This is part of the TCS, (Transmission Controlled Spark Advance system) which essentially limits spark advance at lower rpm. I suggest eliminating/disabling the TCS system so it has no effect on the engine performance. Go to Teambuick.com. They have 71 and 72 manuals you can reference 2 2 Link to comment Share on other sites More sharing options...
Marksan Posted March 31, 2021 Author Share Posted March 31, 2021 (edited) On 3/8/2021 at 9:55 AM, JZRIV said: At first I did not recognize the part because the vacuum nipple is broken off the top but Rivman contacted me and figured out its the TVS/TCS sensor. You need to reference a 72 manual if you have a 72 as I believe the 72 varied a bit in the design of the TCS system vs 71 which was the first year for this messy attempt to control emissions. This is part of the TCS, (Transmission Controlled Spark Advance system) which essentially limits spark advance at lower rpm. I suggest eliminating/disabling the TCS system so it has no effect on the engine performance. Go to Teambuick.com. They have 71 and 72 manuals you can reference Edited April 6, 2021 by Marksan (see edit history) Link to comment Share on other sites More sharing options...
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