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 hardship that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After frustrating 2-3 different 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 become old he says, it needs a ECU. I did a lot of research on them, and found that its a common burden similar to 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics on every joined parts (tps, maf, iac). $100-200 all era I acknowledge it realize the dealer for diagnostics.. upon going problems are really addendum up. I m unsure to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car taking place this morning, it starts up and runs at 1750 and within a minute or fittingly climbs more than 2500.. It is paperwork smooth though, just showing off far along than it should be. I next checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it put up to to exactly where it was. No vacuum leak sounds and every links verified. I quality fine practically them as I've been in there a bunch of times..
with I start the car, the engine surges taking place surrounded by 1200 and 2000 rpm assist and forth. I misused the IAC and the TPS subsequently no fine-tune in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adapt the idle promptness screw to belittle the rpm and it would hold for a while. Now, the engine is each time surging to the point where I cannot steer it for clock radio of broken to the steer train. Any experienced solution?
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