Bad idle investigation

07 Apr 2017

Next on the list was the idle. The car idled high (over 1k RPM) and would sometimes idle erradically when I’d first let off the throttle after accelerating. I started by checking the TPS first, just to make sure the electrical bits were working OK and immediately found problems. The idle switch worked fine, but the position sensor had incorrect voltages. At idle, sometimes it’d read OK, but other times it’d read low (< 0.4v). I never saw it go above 1V even at WOT. I ordered a new TPS and also went ahead and ordered a bluetooth consult dongle thing.