Throttle Position Sensor 1985 Quadrajet W/ Electronically actuated mixture control solenoid

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Lorenblazerk5

Junior Member
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Oct 27, 2025
Posts
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Location
Los Angeles
First Name
Loren
Truck Year
1985
Truck Model
k5
Engine Size
350
Hi,
I am rebuilding my Rochester Quadrajet # 17085508 HMM California carburetor.

I am replacing the TPS that is jumping around when tested on bench. Has anyone had any luck with a particular TPS brands range from $25 - $100. I see manufactures options from Motorad, Holstein, NGK, AC Delco, Walker, Standard, Autoparts, premium.
Looking for someone who actually used one of these brands with success.
Thank you
 

mtbadbob

Supporting Member
Supporting Member
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May 9, 2021
Posts
851
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Location
Montana
First Name
Bob
Truck Year
1987
Truck Model
V20
Engine Size
350
Well, AC Delco are great GM parts. I've also had good luck with Standard & NGK stuff.
 

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