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 trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 2-3 every other 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. urge on to the dealer.. this epoch he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty 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 habit to be re-adjusted? The master tech did all sorts of diagnostics on all united parts (tps, maf, iac). $100-200 all times I understand it complete the dealer for diagnostics.. upon going problems are in reality adding up up. I m hesitant 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 going on this morning, it starts stirring and runs at 1750 and within a minute or hence climbs beyond 2500.. It is dealing out smooth though, just way higher than it should be. I furthermore checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it back to exactly where it was. No vacuum leak sounds and all connections verified. I mood good very nearly them as I've been in there a bunch of times..
in imitation of I start the car, the engine surges taking place in the company of 1200 and 2000 rpm incite and forth. I tainted the IAC and the TPS like no amend in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to accustom yourself the idle keenness screw to degrade the rpm and it would hold for a while. Now, the engine is until the end of time surging to the reduction where I cannot drive it for agitation of damage to the steer train. Any experienced solution?
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