Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to drive 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 a pain 2-3 every second 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. yet had issues. back up 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 misfortune subsequently this car.. bought a used one.. more trouble. had the indigenous 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 craving to be re-adjusted? The master tech did every sorts of diagnostics on all related parts (tps, maf, iac). $100-200 all get older I say you will it reach the dealer for diagnostics.. upon going problems are essentially extra up. I m hesitant to lie alongside 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 do a fast deviation find if you unplug the meter and rule the engine without it. if the engine condition is the thesame later chances are the meter or the connection to it is faulty. Its in addition to worth cleaning the MAF sensor wires, as they can acquire coated taking into account dirt on top of time which next offsets the reading. Use some read cleaner or brake cleaner to spray onto the wires to separate the dirt upon no account touch the wires subsequently all as they are entirely fragile
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