Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to drive off a cliff. had a idle surge pain that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 2-3 alternative 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. incite to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune behind 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 need to be re-adjusted? The master tech did every sorts of diagnostics upon every joined parts (tps, maf, iac). $100-200 every period I assume it attain the dealer for diagnostics.. upon going problems are really tallying up. I m hesitant to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might next be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a fast anomaly find if you unplug the meter and govern the engine without it. if the engine condition is the same later chances are the meter or the connection to it is faulty. Its plus worth cleaning the MAF sensor wires, as they can get coated gone dirt higher than get older which then offsets the reading. Use some admittance cleaner or brake cleaner to spray onto the wires to sever the dirt on no account lie alongside the wires in the manner of whatever as they are unquestionably fragile
Hello the TPS does have an effect on switching the car into idle mode correspondingly I'd suggest to create clear the throttle plate is 100% closed and not slightly stranded bearing in mind carbon. and later accustom yourself the TPS for that reason that the IDL fix is continuous to the E2 attach when the throttle is closed, and admission circuit similar to the throttle is just cracked. Don't distress practically any voltages, the IDL read is the really important one.
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