Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to drive off a cliff. had a idle surge misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After aggravating 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 time he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship taking into consideration 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics on all associated parts (tps, maf, iac). $100-200 all epoch I receive it attain the dealer for diagnostics.. on going problems are essentially appendage up. I m unsure to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car up this morning, it starts going on and runs at 1750 and within a minute or fittingly climbs over 2500.. It is meting out mild though, just artifice far ahead than it should be. I in addition to checked the throttle screw plate/return screw, carefully turned it out and nothing changed. put it help to exactly where it was. No vacuum leak sounds and all connections verified. I feel good nearly them as I've been in there a bunch of times..
as soon as I begin the car, the engine surges stirring surrounded by 1200 and 2000 rpm urge on and forth. I tainted the IAC and the TPS subsequently no fiddle with in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to acclimatize the idle readiness screw to lower the rpm and it would maintain for a while. Now, the engine is continuously surging to the dwindling where I cannot steer it for terrify of damage to the steer train. Any experienced solution?
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