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Happened a couple times to me when I forgot to reconnect MAF or the TB harness when I was cleaning the Tb and another stuff under there.
Are there any CEL or VSC TRAC OFF lights? if there are check the codes or check pending as mine always threw a code when I forgot to reconnect one of them. or Perhaps check the air filter box is sealed as on mine the back right - firewall side is a PITA to get back in place and will idle like crap if the box isn't firmly sealed
I've found just letting it idle for a few minutes after reconnecting it should settle down after about 5 mins or as the temp comes up. The take it for a drive round the block If it doesn't play ball then I disconnect battery and try again. Usually works second time for me. It usually Idles very high and drops down
Chasing lean codes for me was a filthy MAF - didn't have idle issues though just poor throttle response. Could the MAF be faulty or the connection not tight into the intake or electrical? My MAF screws points are stripped and I use a larger threaded screw to keep it in place although my rubber seal around the base of the MAf is super tight so it kinda stays in place without needing the fasteners and I sure as heck use them as I don't want the bugger coming loose or falling out.
The ECM has very limited 2 way tests or the like as far as I'm aware. A good professional Scan tool or the techstream software should have access if the option is there.
2006 Kluger (Highlander) CVX (Sport) 3.3L with leather interior and 7 seats.
Last edited by phoenix2301; 06-19-2019 at 07:01 PM.