Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to drive off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After frustrating 2-3 interchange 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 period he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain subsequently 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 need to be re-adjusted? The master tech did all sorts of diagnostics on every connected parts (tps, maf, iac). $100-200 every grow old I say you will it complete the dealer for diagnostics.. on going problems are in reality tallying 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 stirring this morning, it starts taking place and runs at 1750 and within a minute or fittingly climbs beyond 2500.. It is direction smooth though, just showing off far along than it should be. I also checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it assist to exactly where it was. No vacuum leak sounds and all links verified. I air good about 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. subsequently the MAF is plugged in then the car will stall unless I put my foot on the accelerator. There is also an intermittent popping strong coming at idle.
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