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 trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After maddening 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. nevertheless had issues. urge on to the dealer.. this get older he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship in the same way as 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on all joined parts (tps, maf, iac). $100-200 every become old I undertake it get the dealer for diagnostics.. on going problems are in reality addendum up. I m undecided to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its along with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will every outcome in insufficient fuel innate delivered to the engine. Might then be worth cleaning out the idle promptness manage motor / valve as these acquire clogged taking place in the same way as carbon and some brake cleaner washed through helps clear things off.
Hello the TPS does have an effect upon switching the car into idle mode consequently I'd suggest to make clear the throttle dish is 100% closed and not slightly grounded in the same way as carbon. and next adjust the TPS suitably that the IDL glue is continuous to the E2 pin later the throttle is closed, and admission circuit subsequently the throttle is just cracked. Don't bother nearly any voltages, the IDL entrance is the really important one.
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