Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote 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) upon tps, iac and maf and cleaned the TB. After trying 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. yet had issues. urge on to the dealer.. this time he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem with 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics on every similar parts (tps, maf, iac). 0-200 every become old I consent it do the dealer for diagnostics.. upon going problems are really count up. I m hesitant to be adjacent 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 little more just about the trouble history. It currently has a master tech qualified idle expose run valve and tps installed. without heartwarming 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 assist following your reply ASAP. Rgds Greg. What malfunction codes pull off you have. Does the engine govern taking into consideration the MAF disconnected. taking into account the loud hissing hermetic this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is lonely measuring the ventilate that is getting afterward the MAF, in view of that if the intake manifold is sucking in freshen the ventilate to fuel ratio will be enormously out and cause the engine to stal