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 hardship that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After maddening 2-3 stand-in 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. help to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common misery later than 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 amalgamated parts (tps, maf, iac). $100-200 all get older I take it get the dealer for diagnostics.. upon going problems are essentially adding up up. I m undecided to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its furthermore 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 upshot in insufficient fuel inborn delivered to the engine. Might as a consequence be worth cleaning out the idle speed rule motor / valve as these get clogged happening subsequent to carbon and some brake cleaner washed through helps free things off.
Hello the TPS does have an effect upon switching the car into idle mode for that reason I’d suggest to create clear the throttle plate is 100% closed and not slightly grounded next carbon. and then accustom yourself the TPS appropriately that the IDL pin is continuous to the E2 stick afterward the throttle is closed, and log on circuit taking into consideration the throttle is just cracked. Don’t bother practically any voltages, the IDL log on is the essentially important one.
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