Craig 85
Full Access Member
- Joined
- Jan 25, 2017
- Posts
- 3,914
- Reaction score
- 4,115
- Location
- Nashville, TN
- First Name
- Craig
- Truck Year
- 1985
- Truck Model
- K30 SRW
- Engine Size
- 454/TH-400/NP205
My K30 (454) has it, and after looking through my shop manual I found it. It is a ENGINE SPEED SWITCH related to the Throttle Return Control (TRC). My truck was built 11/84, so all my emissions labels say compliant to 1984 standards. Emissions changed 1/1/85. I know 454's went to dual smog pumps then. Based on what I've read it was used from 79-84.
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