Wiring Diagram Visio Template

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 2-3 exchange used IAC s, I took it to the master tech at lexus. He said it was the IAC valve. He tried my used ones.. and finally a rebuilt one. nevertheless had issues. back to the dealer.. this become old he says, it needs a ECU. I did a lot of research on them, and found that its a common misery in imitation of this car.. bought a used one.. more trouble. had the native one rebuilt by a specialist.. and that s where I am at now.. Put it in tonight and the car idles at 2k rpm. Does the TPS dependence to be re-adjusted? The master tech did every sorts of diagnostics on every combined parts (tps, maf, iac). $100-200 every times I allow it attain the dealer for diagnostics.. upon going problems are truly count up. I m unsure to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Might furthermore be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can pull off a quick aberration locate if you unplug the meter and direct the engine without it. if the engine condition is the similar after that chances are the meter or the connection to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can acquire coated gone dirt higher than times which next offsets the reading. Use some log on cleaner or brake cleaner to vaporizer onto the wires to sever the dirt on no account adjoin the wires bearing in mind all as they are definitely fragile

subsequently I start the car, the engine surges going on amongst 1200 and 2000 rpm back and forth. I misrepresented the IAC and the TPS taking into account no alter in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adjust the idle eagerness screw to lower the rpm and it would preserve for a while. Now, the engine is at all times surging to the dwindling where I cannot steer it for unease of damage to the drive train. Any experienced solution?

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