Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to drive 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 infuriating 2-3 rotate 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 era he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune when this car.. bought a used one.. more trouble. had the original 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 on all related parts (tps, maf, iac). 0-200 every grow old I endure it accomplish the dealer for diagnostics.. upon going problems are in point of fact totaling up. I m unsure to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me tell you a tiny more just about the trouble history. It currently has a master tech approved idle expose rule valve and tps installed. without touching anything, the last (used) ecu and my original, would control in the car without this symptom.
I'm reviewing your question now, and will make known help when your respond ASAP. Rgds Greg. What defect codes attain you have. Does the engine manage in imitation of the MAF disconnected. next the loud hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF partnered it is lonesome measuring the air that is getting once the MAF, consequently if the intake manifold is sucking in expose the let breathe to fuel ratio will be utterly out and cause the engine to stal