Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to drive off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After exasperating 2-3 alternating 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. support to the dealer.. this era he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble gone 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics upon every linked parts (tps, maf, iac). $100-200 all times I admit it get the dealer for diagnostics.. upon going problems are truly tally up. I m hesitant 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 in the works this morning, it starts stirring and runs at 1750 and within a minute or so climbs exceeding 2500.. It is organization mild though, just way complex than it should be. I also checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it back to exactly where it was. No vacuum leak sounds and every associates verified. I air good more or less 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. when the MAF is plugged in next the car will stall unless I put my foot on the accelerator. There is with an intermittent popping hermetically sealed coming at idle.
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