I have a 2004 ES330 similar to a hestitation problem. It is fine from a full end but with I go in this area turns on onto highway ramps, taking into account I distress the accellarator (sp?) it hesitates for 2 seconds past reving up. I ve taken it to a mechanic and he says it is normal. I have an 2003 Avalon like the similar engine and it jumps off the start and has no hesitation. Mechanic s Assistant: Will the headlights tilt on? Is the battery adequately 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 as a result far? I ve cleaned the MAF sensor. Checked for contacts in the intake. subsequently I put my Turbo OBDII app on, all seems good except that the TPS stays constant all but 30%. This is a drive-by-wire model consequently it has not throttle cable or normal TPS. I understand the TPS is integrated like the throttle controller/motor. Mechanic s Assistant: whatever else you desire the mechanic to know previously I attach you? No, I guess that is it.
Its in addition to worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will every outcome in insufficient fuel subconscious delivered to the engine. Might furthermore be worth cleaning out the idle readiness rule motor / valve as these get clogged up once carbon and some brake cleaner washed through helps pardon things off.
This could be a large vacuum leak ,with the MAF connected it is on your own measuring the let breathe that is getting past the MAF, therefore if the intake manifold is sucking in air the ventilate to fuel ratio will be enormously 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 vaporizer vaporizer in the place of the hissing considering the engine organization and as soon as you listen the engine stall or rev cutting edge there is the leak ,could be a bad vacuum hose bad gasket on the manifold.