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 hardship that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After irritating 2-3 substitute 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. nevertheless had issues. urge on to the dealer.. this get older he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune later than this car.. bought a used one.. more trouble. had the original 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 all sorts of diagnostics on every partnered parts (tps, maf, iac). 0-200 every get older I bow to it attain the dealer for diagnostics.. on going problems are in point of fact addendum up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will all outcome in insufficient fuel physical delivered to the engine. Might along with be worth cleaning out the idle eagerness rule motor / valve as these get clogged up behind carbon and some brake cleaner washed through helps forgive things off.
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