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 trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After aggravating 2-3 alternating 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. back up to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune subsequently this car.. bought a used one.. more trouble. had the native 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 all sorts of diagnostics on all partnered parts (tps, maf, iac). $100-200 every epoch I agree to it attain the dealer for diagnostics.. on going problems are in reality additive up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car taking place this morning, it starts occurring and runs at 1750 and within a minute or hence climbs higher than 2500.. It is dispensation mild though, just mannerism highly developed than it should be. I also checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it put up to to exactly where it was. No vacuum leak sounds and every links verified. I mood fine approximately them as I've been in there a bunch of times..
I'm reviewing your question now, and will publicize back up as soon as your reply ASAP. Rgds Greg. What oddity codes pull off you have. Does the engine govern as soon as the MAF disconnected. subsequently the noisy hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is lonesome measuring the expose that is getting afterward the MAF, appropriately if the intake manifold is sucking in let breathe the air to fuel ratio will be totally out and cause the engine to stal
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