Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push 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) upon tps, iac and maf and cleaned the TB. After bothersome 2-3 interchange 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. still had issues. incite to the dealer.. this time he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune in the same way as 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 joined parts (tps, maf, iac). $100-200 all epoch I take it reach the dealer for diagnostics.. on going problems are essentially adding together up. I m of two minds to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might along with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can pull off a quick irregularity locate if you unplug the meter and run the engine without it. if the engine condition is the same after that chances are the meter or the relationship to it is faulty. Its along with worth cleaning the MAF sensor wires, as they can acquire coated gone dirt over get older which later offsets the reading. Use some retrieve cleaner or brake cleaner to spray onto the wires to cut off the dirt upon no account adjoin the wires later than anything as they are agreed fragile
I'm reviewing your ask now, and will publicize back up in the same way as your answer ASAP. Rgds Greg. What deformity codes get you have. Does the engine direct behind the MAF disconnected. later than the loud hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is on your own measuring the let breathe that is getting subsequent to the MAF, fittingly if the intake manifold is sucking in air the ventilate to fuel ratio will be categorically out and cause the engine to stal
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