Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 2-3 oscillate 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. put up to to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship afterward 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics upon all connected parts (tps, maf, iac). $100-200 all get older I endure it do the dealer for diagnostics.. upon going problems are in point of fact appendage up. I m of two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might then be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a fast anomaly find if you unplug the meter and control the engine without it. if the engine condition is the thesame subsequently chances are the meter or the relationship to it is faulty. Its afterward worth cleaning the MAF sensor wires, as they can acquire coated in the same way as dirt greater than grow old which then offsets the reading. Use some entry cleaner or brake cleaner to vaporizer onto the wires to remove the dirt upon no account touch the wires when everything as they are entirely fragile
I'm reviewing your question now, and will say encourage gone your respond ASAP. Rgds Greg. What malformation codes realize you have. Does the engine run subsequent to the MAF disconnected. in imitation of the loud hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is unaccompanied measuring the ventilate that is getting as soon as the MAF, fittingly if the intake manifold is sucking in air the air to fuel ratio will be extremely out and cause the engine to stal
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