I have a 2004 ES330 similar to a hestitation problem. It is fine from a full stop but bearing in mind I go approximately turns upon onto highway ramps, behind I hurt the accellarator (sp?) it hesitates for 2 seconds back reving up. I ve taken it to a mechanic and he says it is normal. I have an 2003 Avalon bearing in mind the similar engine and it jumps off the start and has no hesitation. Mechanic s Assistant: Will the headlights outlook on? Is the battery adequately charged? With or without headlights on. Relatively additional battery. Mechanic s Assistant: What is the model of your 04 Lexus? ES330 Mechanic s Assistant: Are you fixing your vehicle yourself? What have you tried correspondingly far? I ve cleaned the MAF sensor. Checked for associates in the intake. in the same way as I put my Turbo OBDII app on, whatever seems good except that the TPS stays constant roughly speaking 30%. This is a drive-by-wire model fittingly it has not throttle cable or usual TPS. I admit the TPS is integrated in the manner of the throttle controller/motor. Mechanic s Assistant: whatever else you want the mechanic to know past I be close to you? No, I guess that is it.
I started the car in the works this morning, it starts up and runs at 1750 and within a minute or suitably climbs exceeding 2500.. It is presidency serene though, just habit well ahead than it should be. I after that checked the throttle screw plate/return screw, carefully turned it out and nothing changed. put it encourage to exactly where it was. No vacuum leak sounds and every links verified. I quality good approximately them as I've been in there a bunch of times..
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you occurring to date on every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms up and is warmed up? oftentimes in engine acquit yourself many factors may cause the thesame symptom(s)