- Joined
- Oct 27, 2016
- Posts
- 2,452
- Reaction score
- 6,227
- Location
- MO
- First Name
- Spencer
- Truck Year
- 1971, 1̶9̶7̶4, 1976, 1979,1̶9̶8̶5, 2002
- Truck Model
- Dart Swinger, Sierra 10, C10 Cheyenne, C10 Big Ten, Silverado 10, Ram 2500
- Engine Size
- 225/6, 350 c.i., 350 c.i., 5.9l Cummins
Is this the post in question from Craig 85?
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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