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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

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Posted (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 by Marksan (see edit history)
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