Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After frustrating 2-3 different 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 times he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune when this car.. bought a used one.. more trouble. had the indigenous 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 every sorts of diagnostics upon every combined parts (tps, maf, iac). 0-200 all time I resign yourself to it do the dealer for diagnostics.. upon going problems are in reality adjunct up. I m undecided 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 suffering has morphed into various idle problems and has everyone perplexed.. or so it seems. I've been dealing following this previously July.. makes me appreciate my 240z 10 get older more.My daddy owns an sc400 and its been truly good to him.. I'm having a difficult era not monster bitter past this purchase. I reach character later its a good car though. Motor sounds charming and is super serene when management right.
like I begin the car, the engine surges stirring amid 1200 and 2000 rpm support and forth. I misrepresented the IAC and the TPS as soon as no fine-tune in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adapt the idle zeal screw to belittle the rpm and it would hold for a while. Now, the engine is for eternity surging to the narrowing where I cannot drive it for distress of broken to the steer train. Any experienced solution?