Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to drive off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 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. nevertheless had issues. support 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 pain bearing in mind 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics upon all amalgamated parts (tps, maf, iac). $100-200 every become old I take it attain the dealer for diagnostics.. upon going problems are really accumulation up. I m hesitant to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a below par pump will all outcome in insufficient fuel creature delivered to the engine. Might also be worth cleaning out the idle readiness manage motor / valve as these acquire clogged taking place with carbon and some brake cleaner washed through helps forgive things off.
Hello the TPS does have an effect upon switching the car into idle mode therefore I'd suggest to make positive the throttle plate is 100% closed and not slightly ashore in the manner of carbon. and next become accustomed the TPS in view of that that the IDL fix is continuous to the E2 glue following the throttle is closed, and entrance circuit considering the throttle is just cracked. Don't trouble about any voltages, the IDL contact is the truly important one.
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