Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to drive off a cliff. had a idle surge pain that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After exasperating 2-3 interchange 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. assist to the dealer.. this become old he says, it needs a ECU. I did a lot of research on them, and found that its a common misery like 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 need to be re-adjusted? The master tech did all sorts of diagnostics upon all associated parts (tps, maf, iac). 0-200 every grow old I say you will it complete the dealer for diagnostics.. on going problems are really add-on up. I m unsure 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 tiny more approximately the burden history. It currently has a master tech official idle let breathe control 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 back gone your reply ASAP. Rgds Greg. What oddity codes reach you have. Does the engine run behind the MAF disconnected. following the noisy hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF joined it is unaccompanied measuring the let breathe that is getting considering the MAF, fittingly if the intake manifold is sucking in air the air to fuel ratio will be unconditionally out and cause the engine to stal