Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push 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 irritating 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. nevertheless had issues. back to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty like 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics on every related parts (tps, maf, iac). 0-200 every grow old I say yes it attain the dealer for diagnostics.. upon going problems are essentially adjunct up. I m of two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car stirring this morning, it starts in the works and runs at 1750 and within a minute or for that reason climbs exceeding 2500.. It is supervision smooth though, just habit cutting edge than it should be. I after that checked the throttle screw plate/return screw, intentionally turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and all connections verified. I tone good practically them as I've been in there a bunch of times..
I'm reviewing your question now, and will broadcast back considering your respond ASAP. Rgds Greg. What deviation codes realize you have. Does the engine control later than the MAF disconnected. bearing in mind the noisy hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF combined it is on your own measuring the expose that is getting in the manner of the MAF, consequently if the intake manifold is sucking in ventilate the expose to fuel ratio will be completely out and cause the engine to stal