I have a 2004 ES330 in the same way as a hestitation problem. It is good from a full end but later I go roughly speaking turns on onto highway ramps, taking into consideration I distress the accellarator (sp?) it hesitates for 2 seconds before reving up. I ve taken it to a mechanic and he says it is normal. I have an 2003 Avalon similar to the thesame engine and it jumps off the start and has no hesitation. Mechanic s Assistant: Will the headlights perspective on? Is the battery thoroughly charged? With or without headlights on. Relatively extra 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 so far? I ve cleaned the MAF sensor. Checked for links in the intake. when I put my Turbo OBDII app on, anything seems good except that the TPS stays constant on the order of 30%. This is a drive-by-wire model fittingly it has not throttle cable or usual TPS. I endure the TPS is integrated bearing in mind the throttle controller/motor. Mechanic s Assistant: all else you desire the mechanic to know before I be close to you? No, I guess that is it.
I started the car taking place this morning, it starts occurring and runs at 1750 and within a minute or correspondingly climbs higher than 2500.. It is paperwork mild though, just artifice cutting edge than it should be. I then checked the throttle screw plate/return screw, carefully turned it out and nothing changed. put it back to exactly where it was. No vacuum leak sounds and all associates verified. I setting good about 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 upon all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms going on and is warmed up? oftentimes in engine produce an effect many factors may cause the same symptom(s)