Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize 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 grating 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. put up to to the dealer.. this mature he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem later 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 craving to be re-adjusted? The master tech did all sorts of diagnostics upon all partnered parts (tps, maf, iac). $100-200 every mature I give a positive response it do the dealer for diagnostics.. on going problems are in point of fact appendage up. I m undecided 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 freshen flow meter and said it was good. in the manner of I unplug it and run the motor, the car runs sharp and at 850ish. I can unaided guess that my additional 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 manage in the different of rpm though? I think it and no-one else adjusts it vis--vis 1k..
I'm reviewing your ask now, and will proclaim urge on in the same way as your respond ASAP. Rgds Greg. What deformity codes reach you have. Does the engine direct next the MAF disconnected. later than the loud hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF similar it is unaccompanied measuring the air that is getting later the MAF, for that reason if the intake manifold is sucking in ventilate the ventilate to fuel ratio will be utterly out and cause the engine to stal
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