Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to steer off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 2-3 stand-in 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. urge on to the dealer.. this time he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on every aligned parts (tps, maf, iac). $100-200 all epoch I admit it complete the dealer for diagnostics.. on going problems are truly count up. I m undecided to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car taking place this morning, it starts in the works and runs at 1750 and within a minute or as a result climbs on top of 2500.. It is government mild though, just showing off later than it should be. I afterward checked the throttle screw plate/return screw, carefully turned it out and nothing changed. put it back up to exactly where it was. No vacuum leak sounds and every connections verified. I vibes fine about them as I’ve been in there a bunch of times..
considering I begin the car, the engine surges going on between 1200 and 2000 rpm urge on and forth. I changed the IAC and the TPS subsequently no fiddle with in symptoms. I have noticed that several Lexus SC’s have this similar issue. Prior to this I would have to adapt the idle readiness screw to humiliate the rpm and it would preserve for a while. Now, the engine is permanently surging to the reduction where I cannot steer it for alarm bell of broken to the drive train. Any experienced solution?
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