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On my FD Rx7 I set the TPS with my foot off the throttle at 0% and full throttle at 100%. I'm currently experiencing a high idle, but the TPS position is constantly moving about around about .5% when my foot is off the pedal. is this normal behavior, or should I look to replace the TPS? Thanks.
Mine moves around a tiny bit also, really not a problem as long as it stays within a narrow range and is under your zero demand %. Could be a result of not enough free play in the cable or maybe just 25+ year old sensor doing its thing.
My tps sensor has a crack where the connector goes so I priced up a new sensor, at over $800 AUD I'd rather go dbw when the time comes.
The throttle position 'should' be stable and pretty constant when the throttle is closed. One of the common problems I see with noise on the TPS input is that it can end up having the ECU introduce transient enrichment when it's not really needed. This can also be a little tricky to figure out if you don't know to look for it as the fuelling will be quite erratic. Given your high idle though I'd be inclined to confirm that your throttle is closing properly and make sure that the ECU is actually going into idle control mode.