Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to drive off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 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. back up 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 manner of 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics upon all united parts (tps, maf, iac). $100-200 all times I endure it attain the dealer for diagnostics.. upon going problems are truly adding together up. I m hesitant to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car in the works this morning, it starts taking place and runs at 1750 and within a minute or in view of that climbs higher than 2500.. It is executive serene though, just showing off complex than it should be. I moreover checked the throttle screw plate/return screw, carefully turned it out and nothing changed. put it assist to exactly where it was. No vacuum leak sounds and every friends verified. I tone good approximately 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 after that the car will stall unless I put my foot on the accelerator. There is as well as an intermittent popping solid coming at idle.
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