I have a 2004 ES330 with a hestitation problem. It is fine from a full stop but in imitation of I go roughly speaking turns on onto highway ramps, bearing in mind I afflict 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 past the thesame engine and it jumps off the start and has no hesitation. Mechanic s Assistant: Will the headlights tilt on? Is the battery sufficiently 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 therefore far? I ve cleaned the MAF sensor. Checked for contacts in the intake. when I put my Turbo OBDII app on, whatever seems fine except that the TPS stays constant in this area 30%. This is a drive-by-wire model thus it has not throttle cable or normal TPS. I put up with the TPS is integrated afterward the throttle controller/motor. Mechanic s Assistant: all else you desire the mechanic to know back I connect you? No, I guess that is it.
Its moreover worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a below par pump will all outcome in insufficient fuel visceral delivered to the engine. Might as a consequence be worth cleaning out the idle enthusiasm control motor / valve as these acquire clogged going on considering carbon and some brake cleaner washed through helps clear things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you stirring to date on all 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 work many factors may cause the thesame symptom(s)