Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to drive off a cliff. had a idle surge burden that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After maddening 2-3 rotate 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. incite to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common suffering in imitation of 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 every similar parts (tps, maf, iac). $100-200 all become old I take it get the dealer for diagnostics.. on going problems are in reality adjunct up. I m in two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its moreover worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all outcome in insufficient fuel bodily delivered to the engine. Might afterward be worth cleaning out the idle eagerness control motor / valve as these get clogged going on past carbon and some brake cleaner washed through helps clear things off.
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