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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 05-07-2010, 04:40 PM   #1
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Question tps

would a faulty tps possibly keep my car from downshifting????
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Old 05-07-2010, 04:42 PM   #2
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Yes it could. Shifting takes several variables in to consideration when it shifts, like RPM, Throttle position, speed of car, etc. However. If the TPS is a problem you should feel the RPMs change in a not smooth way.
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Old 05-07-2010, 04:51 PM   #3
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becaouse i have dne the test with my multimeter and the 5 volt test is good so i moved on to the next and i have like 0.04 volts at idle and when i move the throttle the volts do not change at all does this sound like a bad tps
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Old 05-07-2010, 04:52 PM   #4
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The voltage should move from low to high smoothly.
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Old 05-07-2010, 04:57 PM   #5
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voltage dont move at all..... but it doesnt idle wierd or anything im just trying to get to the bottom of my downshifting problem its driving me nuts
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Old 05-07-2010, 05:03 PM   #6
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Old 05-07-2010, 05:12 PM   #7
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ok it moves kinda slowly it didnt jump up or anything at idle the reading is 0.96 and wot is like 5 volts so im thinking its good
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Old 05-07-2010, 05:16 PM   #8
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Sounds like the TPS is good. How does it down shift? Is it all gears, or from 4-3 or 3-2, or 2-1. Any problems up shifting?
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Old 05-07-2010, 05:26 PM   #9
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Looking over the manual a faulty TPS is the first thing listed on a low down shift. After that it'* shift solenoid valve problems. And that'* inside the transmission behind the side pan. I suggest having the car scanned. Some transmission codes to not trip a SES light, but will still be stored. Post those codes up here.
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Old 05-07-2010, 05:42 PM   #10
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ok i will * soon as i get it scanned thanx dan
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