I have a 2004 ES330 subsequently a hestitation problem. It is fine from a full end but similar to I go almost turns upon onto highway ramps, taking into account I hurt the accellarator (sp?) it hesitates for 2 seconds previously reving up. I ve taken it to a mechanic and he says it is normal. I have an 2003 Avalon next the thesame engine and it jumps off the start and has no hesitation. Mechanic s Assistant: Will the headlights slant on? Is the battery sufficiently charged? With or without headlights on. Relatively new 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 fittingly far? I ve cleaned the MAF sensor. Checked for contacts in the intake. afterward I put my Turbo OBDII app on, anything seems good except that the TPS stays constant nearly 30%. This is a drive-by-wire model hence it has not throttle cable or normal TPS. I bow to the TPS is integrated considering the throttle controller/motor. Mechanic s Assistant: everything else you want the mechanic to know back I connect you? No, I guess that is it.
I started the car stirring this morning, it starts happening and runs at 1750 and within a minute or hence climbs over 2500.. It is government mild though, just mannerism progressive than it should be. I moreover checked the throttle screw plate/return screw, intentionally turned it out and nothing changed. put it help to exactly where it was. No vacuum leak sounds and all associates verified. I setting fine about them as I've been in there a bunch of times..
This could be a large vacuum leak ,with the MAF united it is solitary measuring the ventilate that is getting in the manner of the MAF, correspondingly if the intake manifold is sucking in ventilate the let breathe to fuel ratio will be entirely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in the same way as carb cleaner vaporizer spray can in the place of the hissing following the engine organization and once you hear the engine stall or rev unconventional there is the leak ,could be a bad vacuum hose bad gasket on the manifold.