Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After maddening 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. still had issues. help to the dealer.. this become old he says, it needs a ECU. I did a lot of research on them, and found that its a common burden with 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics on every joined parts (tps, maf, iac). $100-200 every grow old I endure it realize the dealer for diagnostics.. upon going problems are in point of fact count up. I m unsure to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car stirring this morning, it starts going on and runs at 1750 and within a minute or fittingly climbs beyond 2500.. It is organization smooth though, just artifice future than it should be. I moreover checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it urge on to exactly where it was. No vacuum leak sounds and all contacts verified. I quality fine about them as I've been in there a bunch of times..
in the same way as I begin the car, the engine surges going on amid 1200 and 2000 rpm urge on and forth. I changed the IAC and the TPS in the manner of no alter in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adapt the idle keenness screw to demean the rpm and it would preserve for a while. Now, the engine is for eternity surging to the narrowing where I cannot steer it for bell of broken to the steer train. Any experienced solution?
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