IROCmenace
Full Access Member
- Joined
- Nov 1, 2013
- Posts
- 50
- Reaction score
- 13
- Location
- TN
- First Name
- Shawn
- Truck Year
- 86
- Truck Model
- C2500
- Engine Size
- 350 VIN M
I just fixed the exact same problem, and discovered it was the oil pressure sender that controls the choke, led to a VERY rich mixture, dieseling, and a stupid high idle. All I had to do was change out that little sensor and now it runs smooth as silk, I mean it really purrs. If your 86 is anything like mine (although you have a 350 vs my 454) then that could also be your issue. That's just my 2 cents.
This is what I replaced (from RockAuto):
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Thanks for the insight. Where is this sender on your 454? I haven't seen anything from oil pressure passages other than the big can looking sending unit for the gauge?