Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to steer off a cliff. had a idle surge pain that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 2-3 substitute 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. urge on 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 hardship in the manner of 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 habit to be re-adjusted? The master tech did every sorts of diagnostics upon every united parts (tps, maf, iac). 0-200 all grow old I believe it pull off the dealer for diagnostics.. upon going problems are truly add-on up. I m in two minds to lie alongside 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 in view of that it seems. I've been dealing behind this before July.. makes me appreciate my 240z 10 epoch more.My daddy owns an sc400 and its been essentially good to him.. I'm having a hard grow old not inborn bitter later than this purchase. I pull off setting gone its a good car though. Motor sounds lovable and is super mild past running right.
This could be a large vacuum leak ,with the MAF joined it is without help measuring the let breathe that is getting bearing in mind the MAF, in view of that if the intake manifold is sucking in freshen the freshen to fuel ratio will be enormously out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. subsequent to carb cleaner spray can vaporizer in the place of the hissing subsequently the engine executive and once you hear the engine stall or rev later there is the leak ,could be a bad vacuum hose bad gasket on the manifold.