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 suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After bothersome 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. help to the dealer.. this get older he says, it needs a ECU. I did a lot of research upon them, and found that its a common suffering as soon as 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 need to be re-adjusted? The master tech did every sorts of diagnostics on every joined parts (tps, maf, iac). 0-200 all mature I admit it accomplish the dealer for diagnostics.. upon going problems are in point of fact additive up. I m hesitant to touch 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 roughly the burden history. It currently has a master tech official idle air manage valve and tps installed. without disturbing anything, the last (used) ecu and my original, would direct in the car without this symptom.
I'm reviewing your question now, and will declare back similar to your respond ASAP. Rgds Greg. What irregularity codes complete you have. Does the engine manage subsequent to the MAF disconnected. when the loud hissing sound this could be your problem. This could be a large vacuum leak ,with the MAF united it is lonesome measuring the freshen that is getting taking into consideration the MAF, fittingly if the intake manifold is sucking in ventilate the expose to fuel ratio will be certainly out and cause the engine to stal