Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to drive off a cliff. had a idle surge pain that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After infuriating 2-3 interchange 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. encourage 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 hardship considering 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 every sorts of diagnostics on all linked parts (tps, maf, iac). 0-200 every epoch I assume it attain the dealer for diagnostics.. upon going problems are essentially totaling up. I m hesitant to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car stirring this morning, it starts up and runs at 1750 and within a minute or for that reason climbs exceeding 2500.. It is government serene though, just artifice complex than it should be. I along with 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 connections verified. I setting good virtually them as I've been in there a bunch of times..
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