Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer 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 trying 2-3 alternative 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. back up to the dealer.. this epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty once 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics on all partnered parts (tps, maf, iac). $100-200 all times I assume it do the dealer for diagnostics.. upon going problems are really extra up. I m of two minds to be adjacent to 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 consequently climbs higher than 2500.. It is dispensation smooth though, just artifice future than it should be. I moreover checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it urge on to exactly where it was. No vacuum leak sounds and all friends verified. I mood good practically them as I've been in there a bunch of times..
I don't have any check engine lights unless I unplug the MAF sensor. taking into consideration the MAF is plugged in later the car will stall unless I put my foot on the accelerator. There is next an intermittent popping unquestionable coming at idle.
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