1KZ idles 2,200 rpm after new battery

[on2it Lurker Find all posts View Profile Close on2it]

Dear All, I have a 97 manual Prado 1KZ-TE with 360K
Never misses a beat
Replaced the battery yesterday and on starting began idling at 2,200
Usually it's 800
I disconnected the battery for ten minutes but no change.
YouTube talks of 'idle relearn' on newer vehicles which may or may not be BS
I spoke to an experienced Toyota dealer mechanic who says he's never heard of it.
Any ideas?
Thank you
Richard E

[SamSta Member Find all posts View Profile Close SamSta]

Hmm sounds unusual. Normal idle is 750 rpm (maybe 800 with the aircon on). Has your idle been tweaked before?

Maybe take it for a good drive out on the freeway or something, see if it fixes itself. Just thinking out loud here... if you have the semi-mechanical pump (the one with an accelerator cable going to it), you should be able to adjust the idle on the pump itself. Should be pretty self-explanatory when you look at it. If it's the full electronic pump, then something else might be playing up. Possibly to due with your TPS (throttle position sensor)?

[SamSta Member Find all posts View Profile Close SamSta]

Just stumbled across this in the 95, 120 series Workshop manual.


"The idle speed is not adjustable. A vacuum leak will cause a fast erratic idle or surging depending on how large the leak is"

"Ensure that the dashpot and the throttle opening valve on the throttle body are not seized and are functioning correctly as both of these can cause a fast idle problem. If the idle speed is not to specifications and all other possibilities have been checked, check the ISC valve and all vacuum hoses"