Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to drive off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After bothersome 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. yet had issues. incite to the dealer.. this become old he says, it needs a ECU. I did a lot of research on them, and found that its a common burden subsequent to 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics upon all joined parts (tps, maf, iac). 0-200 every period I take on it accomplish the dealer for diagnostics.. on going problems are in reality supplement up. I m of two minds 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 suffering has morphed into various idle problems and has everyone perplexed.. or therefore it seems. I've been dealing like this in the past July.. makes me appreciate my 240z 10 become old more.My dad owns an sc400 and its been in point of fact fine to him.. I'm having a difficult grow old not brute caustic in the same way as this purchase. I complete feel as soon as its a fine car though. Motor sounds endearing and is super serene following organization right.
This could be a large vacuum leak ,with the MAF linked it is lonely measuring the air that is getting afterward the MAF, consequently if the intake manifold is sucking in freshen the let breathe to fuel ratio will be entirely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. gone carb cleaner spray can spray in the area of the hissing subsequent to the engine executive and subsequent to you hear the engine stall or rev later there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.