Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to drive 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 exasperating 2-3 swap 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. yet had issues. put up to 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 problem in the manner of 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 every sorts of diagnostics upon all related parts (tps, maf, iac). $100-200 all period I admit it accomplish the dealer for diagnostics.. on going problems are really toting up up. I m hesitant to be adjacent to 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 upon the let breathe flow meter and said it was good. following I unplug it and run the motor, the car runs rude and at 850ish. I can single-handedly guess that my supplementary rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of all this. I don't think the tps has that much govern in the every second of rpm though? I think it on your own adjusts it re 1k..
I'm reviewing your ask now, and will make known back like your reply ASAP. Rgds Greg. What aberration codes pull off you have. Does the engine manage subsequent to the MAF disconnected. when the loud hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF partnered it is deserted measuring the expose that is getting once the MAF, hence if the intake manifold is sucking in air the let breathe to fuel ratio will be completely out and cause the engine to stal
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