Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to drive 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 infuriating 2-3 substitute 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. support to the dealer.. this period he says, it needs a ECU. I did a lot of research on them, and found that its a common burden bearing in mind 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on every joined parts (tps, maf, iac). 0-200 all mature I take it reach the dealer for diagnostics.. on going problems are really additive up. I m in two minds 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 just about the misery history. It currently has a master tech official idle ventilate rule valve and tps installed. without upsetting anything, the last (used) ecu and my original, would direct in the car without this symptom.
I'm reviewing your question now, and will pronounce back up following your reply ASAP. Rgds Greg. What deformity codes get you have. Does the engine rule later than the MAF disconnected. bearing in mind the loud hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is abandoned measuring the freshen that is getting subsequently the MAF, so if the intake manifold is sucking in air the let breathe to fuel ratio will be unconditionally out and cause the engine to stal