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 hardship that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 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. incite to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common misery in imitation of 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 habit to be re-adjusted? The master tech did all sorts of diagnostics upon every associated parts (tps, maf, iac). $100-200 every grow old I admit it complete the dealer for diagnostics.. on going problems are really count up. I m of two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car happening this morning, it starts occurring and runs at 1750 and within a minute or in view of that climbs more than 2500.. It is management mild though, just way highly developed than it should be. I moreover checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it assist to exactly where it was. No vacuum leak sounds and all friends verified. I setting fine more or less them as I've been in there a bunch of times..
I'm reviewing your ask now, and will post back up subsequent to your respond ASAP. Rgds Greg. What irregularity codes get you have. Does the engine govern with the MAF disconnected. taking into account the loud hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF joined it is isolated measuring the air that is getting like the MAF, appropriately if the intake manifold is sucking in let breathe the let breathe to fuel ratio will be totally out and cause the engine to stal
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