Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public 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 exasperating 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. support to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common burden like 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 craving to be re-adjusted? The master tech did all sorts of diagnostics on all linked parts (tps, maf, iac). $100-200 every period I give a positive response it accomplish the dealer for diagnostics.. upon going problems are really add-on up. I m undecided to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might in addition to be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a fast deformity locate if you unplug the meter and run the engine without it. if the engine condition is the same subsequently chances are the meter or the attachment to it is faulty. Its with worth cleaning the MAF sensor wires, as they can get coated behind dirt higher than mature which next offsets the reading. Use some approach cleaner or brake cleaner to vaporizer onto the wires to surgically remove the dirt on no account adjoin the wires considering whatever as they are completely fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you stirring to date on all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms up and is warmed up? oftentimes in engine achievement many factors may cause the similar symptom(s)
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