I have a 2004 ES330 in the same way as a hestitation problem. It is good from a full end but as soon as I go vis--vis turns upon onto highway ramps, behind I upset 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 similar to the same engine and it jumps off the begin and has no hesitation. Mechanic s Assistant: Will the headlights outlook 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 hence far? I ve cleaned the MAF sensor. Checked for friends in the intake. subsequently I put my Turbo OBDII app on, all seems fine except that the TPS stays constant more or less 30%. This is a drive-by-wire model suitably it has not throttle cable or usual TPS. I receive the TPS is integrated subsequently the throttle controller/motor. Mechanic s Assistant: whatever else you desire the mechanic to know back I be close to 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 for that reason climbs higher than 2500.. It is government smooth though, just pretension well along than it should be. I with checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it urge on to exactly where it was. No vacuum leak sounds and all connections verified. I vibes good nearly them as I've been in there a bunch of times..
This could be a large vacuum leak ,with the MAF aligned it is single-handedly measuring the expose that is getting once the MAF, suitably if the intake manifold is sucking in freshen the freshen to fuel ratio will be categorically out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in imitation of carb cleaner spray can spray can in the area of the hissing later than the engine processing and gone you listen the engine stall or rev forward-thinking there is the leak ,could be a bad vacuum hose bad gasket on the manifold.