Replaced TPS-fixed low-load miss - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-20-2003, 01:45 PM   #1
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Default Replaced TPS-fixed low-load miss

I was noticing a low-load miss on my 94 SE. It was noticable when pulling away from a stop with light throttle( OK, I realize most of you probably never do this!) and also when cruising in overdrive with light throttle). It was really noticable when the cruise control was on and in overdrive- causing some shaking. Thought about plug wires, had already replaced plugs, check engine light was not coming on. I was getting ready to buy plugs at my local Advance Auto when the counter guy suggested I check the resistance on the Throttle Position sensor since the problem was occuring when the throttle was in approximately the same position. I went back home, hooked up my digital mutlimeter to the TPS and moved the arm on the sensor to see what it did. Sure enough, I was getting a non-linear reading as I moved it off the idle position. The resistance would start to go down, then jump up and then move down again as I simulated opening up the throttle.
Put a new TPS in and it works great (these are a pain to remove without taking off the whole throttle body and upper intake). Removing the upper radiator hose gave me a little more room to work.
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