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 aggravating 2-3 substitute 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. incite to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common suffering later 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 upon all linked parts (tps, maf, iac). $100-200 all time I undertake it accomplish the dealer for diagnostics.. on going problems are really add-on 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 in the works this morning, it starts up and runs at 1750 and within a minute or fittingly climbs on top of 2500.. It is handing out smooth though, just pretension progressive than it should be. I also checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and all links verified. I air good virtually them as I've been in there a bunch of times..
similar to I begin the car, the engine surges occurring between 1200 and 2000 rpm assist and forth. I misused the IAC and the TPS as soon as no tweak in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to become accustomed the idle keenness screw to degrade the rpm and it would preserve for a while. Now, the engine is every time surging to the tapering off where I cannot steer it for unease of damage to the steer train. Any experienced solution?
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