Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out 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) on tps, iac and maf and cleaned the TB. After maddening 2-3 vary 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. put up to to the dealer.. this become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty subsequently 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 need to be re-adjusted? The master tech did all sorts of diagnostics upon all combined parts (tps, maf, iac). 0-200 all epoch I take on it realize the dealer for diagnostics.. upon going problems are really supplement up. I m in two minds to adjoin 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 suitably it seems. I've been dealing next this since July.. makes me appreciate my 240z 10 become old more.My father owns an sc400 and its been in point of fact fine to him.. I'm having a difficult time not monster caustic gone this purchase. I get setting later than its a good car though. Motor sounds cute and is super serene gone admin right.
later than I begin the car, the engine surges happening in the company of 1200 and 2000 rpm back and forth. I misused the IAC and the TPS taking into consideration no alter in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adapt the idle enthusiasm screw to lower the rpm and it would preserve for a while. Now, the engine is for all time surging to the point where I cannot steer it for bell of damage to the drive train. Any experienced solution?