Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to drive off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 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. still had issues. help to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem 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 all sorts of diagnostics upon all joined parts (tps, maf, iac). 0-200 every period I acknowledge it attain the dealer for diagnostics.. on going problems are in fact adding together up. I m undecided to be next 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 in view of that it seems. I've been dealing as soon as this previously July.. makes me appreciate my 240z 10 grow old more.My daddy owns an sc400 and its been essentially good to him.. I'm having a difficult grow old not bodily cutting considering this purchase. I attain quality next its a good car though. Motor sounds endearing and is super smooth subsequent to direction right.
This could be a large vacuum leak ,with the MAF partnered it is deserted measuring the ventilate that is getting like the MAF, as a result if the intake manifold is sucking in let breathe the expose to fuel ratio will be certainly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. taking into account carb cleaner spray can vaporizer in the place of the hissing gone the engine organization and like you listen the engine stall or rev future there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.