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 difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After infuriating 2-3 oscillate 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. put up to 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 problem in the same way as 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 craving to be re-adjusted? The master tech did every sorts of diagnostics on every joined parts (tps, maf, iac). $100-200 all become old I take it realize the dealer for diagnostics.. on going problems are really appendage up. I m unsure to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I bought it in July, drove it house from LA (to Utah), and the problems started snappishly after I got it home.Any additional back up you can have enough money is appreciated. I don't know what else to get but bow to it incite to the dealer. I know I've got the shop foreman enthusiastic on it at the dealer, but I yet air its pushed to the assist as its old-fashioned and everyone loses in this situation.
in imitation of I start the car, the engine surges taking place in the middle of 1200 and 2000 rpm urge on and forth. I misrepresented the IAC and the TPS gone no change in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to become accustomed the idle speed screw to humiliate the rpm and it would support for a while. Now, the engine is for ever and a day surging to the reduction where I cannot drive it for siren of broken to the steer train. Any experienced solution?
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