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I have a 2004 ES330 with a hestitation problem. It is good from a full stop but when I go re turns upon onto highway ramps, in the same way as 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 past the similar engine and it jumps off the begin and has no hesitation. Mechanic s Assistant: Will the headlights slant on? Is the battery thoroughly charged? With or without headlights on. Relatively further 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 suitably far? I ve cleaned the MAF sensor. Checked for contacts in the intake. when I put my Turbo OBDII app on, anything seems good except that the TPS stays constant going on for 30%. This is a drive-by-wire model as a result it has not throttle cable or normal TPS. I say you will the TPS is integrated later the throttle controller/motor. Mechanic s Assistant: everything else you want the mechanic to know in the past I attach you? No, I guess that is it.

I started the car occurring this morning, it starts up and runs at 1750 and within a minute or hence climbs higher than 2500.. It is admin mild though, just way vanguard than it should be. I next checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it encourage to exactly where it was. No vacuum leak sounds and all associates verified. I tone fine about them as I've been in there a bunch of times..

This could be a large vacuum leak ,with the MAF combined it is single-handedly measuring the air that is getting taking into account the MAF, correspondingly if the intake manifold is sucking in freshen the freshen to fuel ratio will be completely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. later carb cleaner spray can spray can in the place of the hissing behind the engine organization and bearing in mind you listen the engine stall or rev later there is the leak ,could be a bad vacuum hose bad gasket on the manifold.