Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out 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 infuriating 2-3 alternating 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 time he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune later 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 upon every combined parts (tps, maf, iac). 0-200 all epoch I say yes it attain the dealer for diagnostics.. upon going problems are essentially adding up. I m of two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its afterward worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will all upshot in insufficient fuel physical delivered to the engine. Might afterward be worth cleaning out the idle speed direct motor / valve as these get clogged stirring next carbon and some brake cleaner washed through helps forgive things off.
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