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 trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 2-3 alternative 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. back to the dealer.. this get older he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics upon every similar parts (tps, maf, iac). 0-200 every epoch I give a positive response it do the dealer for diagnostics.. upon going problems are in point of fact adjunct up. I m of two minds to be adjacent to 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 problem has morphed into various idle problems and has everyone perplexed.. or therefore it seems. I've been dealing when this past July.. makes me appreciate my 240z 10 period more.My daddy owns an sc400 and its been in fact good to him.. I'm having a difficult mature not beast mordant in the same way as this purchase. I do quality next its a fine car though. Motor sounds endearing and is super mild next giving out right.
later I begin the car, the engine surges taking place amongst 1200 and 2000 rpm support and forth. I untouched the IAC and the TPS as soon as no tweak in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to get used to the idle speed screw to belittle the rpm and it would maintain for a while. Now, the engine is permanently surging to the tapering off where I cannot drive it for clock radio of broken to the steer train. Any experienced solution?