Hello, I have repaired higher than 30000 vehicles in my career and I habit to question you questions back I am not there in person to collect facts, data, or to exam your vehicle. I may question you to play a part examination in my stead. If scrutiny is needed and you would rather not produce an effect testing, I can give my best advice, Fuel pressure?
Might plus be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can pull off a quick malformation locate if you unplug the meter and govern the engine without it. if the engine condition is the thesame after that chances are the meter or the connection to it is faulty. Its plus worth cleaning the MAF sensor wires, as they can acquire coated in the manner of dirt greater than times which after that offsets the reading. Use some edit cleaner or brake cleaner to spray onto the wires to surgically remove the dirt on no account lie alongside the wires considering all as they are totally fragile
as soon as I start the car, the engine surges going on in the company of 1200 and 2000 rpm help and forth. I changed the IAC and the TPS next no alter in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to familiarize the idle readiness screw to humiliate the rpm and it would sustain for a while. Now, the engine is at all times surging to the reduction where I cannot steer it for terrify of broken to the drive train. Any experienced solution?