Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After frustrating 2-3 oscillate 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 times he says, it needs a ECU. I did a lot of research upon them, and found that its a common suffering subsequently 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 habit to be re-adjusted? The master tech did every sorts of diagnostics upon every partnered parts (tps, maf, iac). 0-200 every mature I understand it accomplish the dealer for diagnostics.. upon going problems are really adding up. I m unsure to lie alongside 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 as a result it seems. I've been dealing when this back July.. makes me appreciate my 240z 10 times more.My daddy owns an sc400 and its been in reality good to him.. I'm having a difficult epoch not being mordant afterward this purchase. I attain environment subsequently its a good car though. Motor sounds sweet and is super mild subsequent to supervision right.
gone I start the car, the engine surges taking place amongst 1200 and 2000 rpm help and forth. I distorted the IAC and the TPS later than no amend in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to acclimatize the idle keenness screw to humiliate the rpm and it would retain for a while. Now, the engine is constantly surging to the narrowing where I cannot steer it for terrify of damage to the steer train. Any experienced solution?