Throttle Position Sensor Question

[Narkhelek]

My ScanGauge use to report my TPS at 99% with the accelerator pedal floored. Lately it's been reporting 82%. I've verified that the throttle plate is wide open. Is this a non-issue or would I be losing some HP since the ECU doesn't see the Throttle wide open?

 

[nashman69g]

Does it give you voltage readings? Also does your ScanGauge allow for recalibration?

 

[Narkhelek]

Does it give you voltage readings? Also does your ScanGauge allow for recalibration?

No voltage readings are given. My ScanGaugeII isn't that smart. I believe it just reports on what the ECU thinks the percentage of open is based on the interpretation of the voltage from the TPS. I wouldn't have thought anything of it except that what it's reporting now has changed at some point. Maybe that's just part of the ECU learning process?

Anyone who has a scangauge can you report what your TPS reading is at open throttle?