I have a 2004 ES330 in the same way as a hestitation problem. It is good from a full end but taking into consideration I go on the subject of turns upon onto highway ramps, later than I depress the accellarator (sp?) it hesitates for 2 seconds before reving up. I ve taken it to a mechanic and he says it is normal. I have an 2003 Avalon when the similar engine and it jumps off the begin and has no hesitation. Mechanic s Assistant: Will the headlights slant on? Is the battery sufficiently 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 so far? I ve cleaned the MAF sensor. Checked for friends in the intake. past I put my Turbo OBDII app on, all seems good except that the TPS stays constant almost 30%. This is a drive-by-wire model fittingly it has not throttle cable or normal TPS. I say yes the TPS is integrated once the throttle controller/motor. Mechanic s Assistant: whatever else you desire the mechanic to know past I be next to you? No, I guess that is it.
Might after that be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a fast malformation locate if you unplug the meter and direct the engine without it. if the engine condition is the thesame subsequently chances are the meter or the attachment to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can acquire coated subsequent to dirt exceeding get older which then offsets the reading. Use some gain access to cleaner or brake cleaner to spray can onto the wires to surgically remove the dirt on no account adjoin the wires in imitation of all as they are entirely fragile
This could be a large vacuum leak ,with the MAF associated it is unaccompanied measuring the expose that is getting when the MAF, therefore if the intake manifold is sucking in let breathe the ventilate to fuel ratio will be extremely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. with carb cleaner vaporizer spray can in the area of the hissing bearing in mind the engine dispensation and as soon as you hear the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket on the manifold.