Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market 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 aggravating 2-3 swing 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. support to the dealer.. this times he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem like 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics upon all associated parts (tps, maf, iac). 0-200 all get older I resign yourself to it reach the dealer for diagnostics.. upon going problems are in reality accumulation up. I m unsure 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 hardship has morphed into various idle problems and has everyone perplexed.. or appropriately it seems. I've been dealing with this past July.. makes me appreciate my 240z 10 epoch more.My daddy owns an sc400 and its been in point of fact fine to him.. I'm having a hard times not brute critical subsequently this purchase. I realize feel similar to its a fine car though. Motor sounds lovable and is super smooth later management right.
This could be a large vacuum leak ,with the MAF joined it is unaided measuring the expose that is getting past the MAF, therefore if the intake manifold is sucking in air the freshen 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. later than carb cleaner vaporizer spray can in the place of the hissing taking into consideration the engine government and in the manner of you hear the engine stall or rev unconventional there is the leak ,could be a bad vacuum hose bad gasket on the manifold.