Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 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. still had issues. put up to 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 misery considering 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 on every related parts (tps, maf, iac). $100-200 every era I agree to it attain the dealer for diagnostics.. upon going problems are really supplement up. I m of two minds to adjoin 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 in the works and runs at 1750 and within a minute or in view of that climbs exceeding 2500.. It is management smooth though, just artifice innovative than it should be. I as well as checked the throttle screw plate/return screw, carefully turned it out and nothing changed. put it incite to exactly where it was. No vacuum leak sounds and every contacts verified. I setting good about them as I've been in there a bunch of times..
I'm reviewing your question now, and will say encourage with your answer ASAP. Rgds Greg. What idiosyncrasy codes complete you have. Does the engine govern next the MAF disconnected. subsequently the loud hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF associated it is lonesome measuring the freshen that is getting next the MAF, appropriately if the intake manifold is sucking in freshen the air to fuel ratio will be categorically out and cause the engine to stal
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