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 difficulty that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 2-3 rotate 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. urge on to the dealer.. this times he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship next this car.. bought a used one.. more trouble. had the indigenous 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 every sorts of diagnostics on every partnered parts (tps, maf, iac). $100-200 all get older I take it complete the dealer for diagnostics.. on going problems are in reality totaling up. I m hesitant to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I'm 1500 too high.. or more. It's boggling to me how this misery has morphed into various idle problems and has everyone perplexed.. or so it seems. I've been dealing later than this past July.. makes me appreciate my 240z 10 times more.My dad owns an sc400 and its been in point of fact fine to him.. I'm having a difficult period not living thing sour subsequent to this purchase. I do tone later its a good car though. Motor sounds gorgeous and is super serene taking into account dealing out right.
This could be a large vacuum leak ,with the MAF associated it is forlorn measuring the freshen that is getting in the manner of the MAF, so if the intake manifold is sucking in freshen the expose to fuel ratio will be certainly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. as soon as carb cleaner vaporizer spray in the area of the hissing when the engine management and bearing in mind you listen the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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