Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce 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) on tps, iac and maf and cleaned the TB. After infuriating 2-3 swap 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 period he says, it needs a ECU. I did a lot of research on them, and found that its a common misery gone 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 habit to be re-adjusted? The master tech did all sorts of diagnostics on every similar parts (tps, maf, iac). $100-200 every get older I consent it get the dealer for diagnostics.. on going problems are essentially adding up up. I m of two minds to lie alongside 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 attain a quick fault locate if you unplug the meter and manage the engine without it. if the engine condition is the similar subsequently chances are the meter or the membership to it is faulty. Its after that worth cleaning the MAF sensor wires, as they can get coated taking into account dirt more than become old which next offsets the reading. Use some admission cleaner or brake cleaner to vaporizer onto the wires to cut off the dirt upon no account adjoin the wires later than everything as they are unconditionally fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you stirring to date upon every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms going on and is warmed up? oftentimes in engine exploit many factors may cause the thesame symptom(s)
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