I have a 2004 ES330 once a hestitation problem. It is good from a full end but in the manner of I go approximately turns on onto highway ramps, next I distress 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 taking into account the similar engine and it jumps off the begin and has no hesitation. Mechanic s Assistant: Will the headlights tilt on? Is the battery abundantly 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 in view of that far? I ve cleaned the MAF sensor. Checked for friends in the intake. bearing in mind I put my Turbo OBDII app on, all seems fine except that the TPS stays constant regarding 30%. This is a drive-by-wire model appropriately it has not throttle cable or usual TPS. I take the TPS is integrated following the throttle controller/motor. Mechanic s Assistant: whatever else you want the mechanic to know back I connect you? No, I guess that is it.
Its plus worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all result in insufficient fuel inborn delivered to the engine. Might in addition to be worth cleaning out the idle readiness manage motor / valve as these acquire clogged up in imitation of carbon and some brake cleaner washed through helps free things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you taking place 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 happening and is warmed up? oftentimes in engine operate many factors may cause the similar symptom(s)