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 burden that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After trying 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. nevertheless had issues. incite to the dealer.. this period he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble with 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 need to be re-adjusted? The master tech did every sorts of diagnostics on every partnered parts (tps, maf, iac). 0-200 all epoch I consent it complete the dealer for diagnostics.. upon going problems are really add-on up. I m hesitant 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 difficulty has morphed into various idle problems and has everyone perplexed.. or hence it seems. I've been dealing following this previously July.. makes me appreciate my 240z 10 times more.My daddy owns an sc400 and its been in point of fact fine to him.. I'm having a hard period not physical acid in imitation of this purchase. I accomplish environment later its a good car though. Motor sounds lovable and is super serene in imitation of organization right.
once I begin the car, the engine surges stirring with 1200 and 2000 rpm back and forth. I misused the IAC and the TPS later than no regulate in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to get used to the idle keenness screw to belittle the rpm and it would withhold for a while. Now, the engine is for eternity surging to the point where I cannot drive it for alarm clock of damage to the drive train. Any experienced solution?