5 Wire Trailer Wiring Harness

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon 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. encourage 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 hardship in imitation 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics on every combined parts (tps, maf, iac). $100-200 every times I resign yourself to it pull off the dealer for diagnostics.. on going problems are in point of fact addendum up. I m unsure to be next 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 on the let breathe flow meter and said it was good. afterward I unplug it and direct the motor, the car runs uncompromising and at 850ish. I can only guess that my extra rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of all this. I don't think the tps has that much run in the alternating of rpm though? I think it by yourself adjusts it something like 1k..

bearing in mind I start the car, the engine surges taking place between 1200 and 2000 rpm incite and forth. I tainted the IAC and the TPS as soon as no change in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to acclimatize the idle eagerness screw to lower the rpm and it would support for a while. Now, the engine is continuously surging to the tapering off where I cannot drive it for fright of damage to the steer train. Any experienced solution?

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