I have a 2004 ES330 similar to a hestitation problem. It is fine from a full end but once I go in this area turns on onto highway ramps, afterward I afflict 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 thesame engine and it jumps off the start and has no hesitation. Mechanic s Assistant: Will the headlights aim 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 suitably far? I ve cleaned the MAF sensor. Checked for contacts in the intake. later than I put my Turbo OBDII app on, everything seems good except that the TPS stays constant in relation to 30%. This is a drive-by-wire model in view of that it has not throttle cable or usual TPS. I assume the TPS is integrated when 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.
Its also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all repercussion in insufficient fuel subconscious delivered to the engine. Might also be worth cleaning out the idle speed govern motor / valve as these acquire clogged in the works bearing in mind carbon and some brake cleaner washed through helps pardon things off.
I'm reviewing your ask now, and will publicize assist behind your respond ASAP. Rgds Greg. What deviation codes get you have. Does the engine run following the MAF disconnected. taking into account the noisy hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF connected it is single-handedly measuring the freshen that is getting considering the MAF, thus if the intake manifold is sucking in freshen the freshen to fuel ratio will be utterly out and cause the engine to stal