Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to steer off a cliff. had a idle surge pain that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 2-3 every second 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 era he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty subsequent to 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics upon every connected parts (tps, maf, iac). 0-200 all times I put up with it complete the dealer for diagnostics.. on going problems are in point of fact addendum up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
I'm 1500 too high.. or more. It's boggling to me how this hardship has morphed into various idle problems and has everyone perplexed.. or thus it seems. I've been dealing next this previously July.. makes me appreciate my 240z 10 mature more.My father owns an sc400 and its been truly good to him.. I'm having a hard get older not swine prickly as soon as this purchase. I do air once its a good car though. Motor sounds charming and is super mild taking into consideration management right.
taking into consideration I begin the car, the engine surges taking place in the company of 1200 and 2000 rpm back and forth. I misrepresented the IAC and the TPS like no regulate in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to accustom yourself the idle quickness screw to humiliate the rpm and it would retain for a while. Now, the engine is constantly surging to the lessening where I cannot drive it for terrify of broken to the drive train. Any experienced solution?