Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to steer 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 exchange 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 on them, and found that its a common misery subsequently 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 need to be re-adjusted? The master tech did all sorts of diagnostics upon all similar parts (tps, maf, iac). $100-200 every grow old I allow it complete the dealer for diagnostics.. upon going problems are in point of fact adding up. I m of two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car taking place this morning, it starts up and runs at 1750 and within a minute or correspondingly climbs more than 2500.. It is dispensation serene though, just exaggeration complex than it should be. I next checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it assist to exactly where it was. No vacuum leak sounds and all friends verified. I tone fine more or less them as I've been in there a bunch of times..
behind I begin the car, the engine surges occurring with 1200 and 2000 rpm encourage and forth. I misrepresented the IAC and the TPS bearing in mind no tweak in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to accustom yourself the idle zeal screw to belittle the rpm and it would hold for a while. Now, the engine is constantly surging to the narrowing where I cannot steer it for anxiety of broken to the steer train. Any experienced solution?
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