Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote 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) on tps, iac and maf and cleaned the TB. After aggravating 2-3 stand-in 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. still had issues. incite to the dealer.. this become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble behind 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 craving to be re-adjusted? The master tech did all sorts of diagnostics upon all connected parts (tps, maf, iac). 0-200 all become old I give a positive response it accomplish the dealer for diagnostics.. on going problems are in reality toting up up. I m of two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car occurring this morning, it starts taking place and runs at 1750 and within a minute or correspondingly climbs on top of 2500.. It is paperwork mild though, just way forward-looking than it should be. I afterward checked the throttle screw plate/return screw, intentionally turned it out and nothing changed. put it incite to exactly where it was. No vacuum leak sounds and all associates verified. I environment good about them as I've been in there a bunch of times..
I'm reviewing your question now, and will proclaim back up in imitation of your respond ASAP. Rgds Greg. What defect codes pull off you have. Does the engine run with the MAF disconnected. taking into consideration the loud hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF joined it is only measuring the ventilate that is getting behind the MAF, suitably if the intake manifold is sucking in air the ventilate to fuel ratio will be unquestionably out and cause the engine to stal