Thread: Won't idle
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Old 12-05-2021, 04:05 PM   #8
142 guy
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Join Date: May 2014
Location: Saskatchewan, Canada
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Originally Posted by CAPT_BLOTTO View Post
I've also found there's something going on with my TPS. It has a good signal when the engine is off but as soon as I start cranking or get it running it's out of control. Wild swings up and down. It's going ± 20% while keeping it steady so I need to dig into that.
+/- 20% is a 40% variation. If you have correctly calibrated your TPS in Tuner Studio to full closed and full open, a 40% variation in TPS signal is too much for vibration induced fluctuations unless something is broken in the TPS. I would start looking for problems in the signal path such as stray ground currents getting coupled into the TPS ground path and creating ground offset voltages.
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