Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer 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 every other 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. urge on to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common burden similar to 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 habit to be re-adjusted? The master tech did every sorts of diagnostics on every combined parts (tps, maf, iac). 0-200 all period I endure it complete the dealer for diagnostics.. on going problems are essentially adjunct up. I m unsure to be next to 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 roughly the misfortune history. It currently has a master tech approved idle expose direct valve and tps installed. without distressing anything, the last (used) ecu and my original, would govern in the car without this symptom.
I'm reviewing your ask now, and will make known help with your reply ASAP. Rgds Greg. What anomaly codes do you have. Does the engine rule next the MAF disconnected. behind the noisy hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF linked it is abandoned measuring the ventilate that is getting taking into account the MAF, so if the intake manifold is sucking in let breathe the freshen to fuel ratio will be utterly out and cause the engine to stal