Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After exasperating 2-3 swing 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. support to the dealer.. this become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery next 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 need to be re-adjusted? The master tech did every sorts of diagnostics on all aligned parts (tps, maf, iac). $100-200 all era I acknowledge it pull off the dealer for diagnostics.. on going problems are in reality supplement up. I m hesitant to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I did re-check them tho. The master tech did extensive tests on the air flow meter and said it was good. with I unplug it and run the motor, the car runs scratchy and at 850ish. I can lonely guess that my other rebuilt ecu has an issue, or the tps needs to be re-adjusted, or somehow my maf has died in the midst of all this. I don't think the tps has that much direct in the interchange of rpm though? I think it on your own adjusts it in the region of 1k..
Hello the TPS does have an effect on switching the car into idle mode fittingly I'd suggest to create positive the throttle plate is 100% closed and not slightly beached similar to carbon. and subsequently acclimatize the TPS consequently that the IDL stick is continuous to the E2 fix later than the throttle is closed, and edit circuit when the throttle is just cracked. Don't worry roughly any voltages, the IDL gate is the really important one.
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