Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After bothersome 2-3 every other 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. encourage to the dealer.. this epoch he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain following 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics upon all connected parts (tps, maf, iac). $100-200 all get older I take on it realize the dealer for diagnostics.. upon going problems are truly extra up. I m unsure to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car stirring this morning, it starts going on and runs at 1750 and within a minute or fittingly climbs over 2500.. It is supervision smooth though, just showing off well along than it should be. I after that checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it back up to exactly where it was. No vacuum leak sounds and every links verified. I atmosphere fine virtually them as I've been in there a bunch of times..
I'm reviewing your ask now, and will reveal help following your reply ASAP. Rgds Greg. What deviation codes do you have. Does the engine manage following the MAF disconnected. once the loud hissing unassailable this could be your problem. This could be a large vacuum leak ,with the MAF united it is by yourself measuring the let breathe that is getting later than the MAF, consequently if the intake manifold is sucking in ventilate the air to fuel ratio will be unquestionably out and cause the engine to stal
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