Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to drive off a cliff. had a idle surge burden that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 2-3 alternating 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. nevertheless had issues. help 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 burden like this car.. bought a used one.. more trouble. had the original 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 all epoch I endure it do the dealer for diagnostics.. on going problems are really adding up. I m in two minds to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I'm 1500 too high.. or more. It's boggling to me how this pain has morphed into various idle problems and has everyone perplexed.. or correspondingly it seems. I've been dealing following this past July.. makes me appreciate my 240z 10 become old more.My daddy owns an sc400 and its been in point of fact good to him.. I'm having a difficult time not inborn biting in imitation of this purchase. I complete setting when its a fine car though. Motor sounds lovely and is super mild in imitation of organization right.
taking into consideration I begin the car, the engine surges happening amongst 1200 and 2000 rpm back up and forth. I misrepresented the IAC and the TPS when no tweak in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adjust the idle enthusiasm screw to lower the rpm and it would maintain for a while. Now, the engine is for ever and a day surging to the dwindling where I cannot steer it for terrify of broken to the drive train. Any experienced solution?
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