Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to drive off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After exasperating 2-3 exchange 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. encourage 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 difficulty afterward this car.. bought a used one.. more trouble. had the original 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics on all combined parts (tps, maf, iac). 0-200 every grow old I allow it reach the dealer for diagnostics.. on going problems are in reality calculation up. I m hesitant to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I did re-check them tho. The master tech did extensive tests upon the expose flow meter and said it was good. when I unplug it and rule the motor, the car runs argumentative and at 850ish. I can by yourself 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 every this. I don't think the tps has that much control in the vary of rpm though? I think it isolated adjusts it on the subject of 1k..
when I begin the car, the engine surges up together with 1200 and 2000 rpm back up and forth. I distorted the IAC and the TPS bearing in mind no regulate in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to acclimatize the idle keenness screw to demean the rpm and it would sustain for a while. Now, the engine is each time surging to the reduction where I cannot drive it for siren of broken to the drive train. Any experienced solution?