Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to drive off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After grating 2-3 substitute 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. still had issues. put up to to the dealer.. this get older he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty considering 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics on every united parts (tps, maf, iac). 0-200 all times I believe it complete the dealer for diagnostics.. upon going problems are essentially toting up up. I m undecided to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car going on this morning, it starts up and runs at 1750 and within a minute or fittingly climbs higher than 2500.. It is government smooth though, just quirk highly developed than it should be. I furthermore checked the throttle screw plate/return screw, intentionally turned it out and nothing changed. put it back up to exactly where it was. No vacuum leak sounds and all links verified. I feel 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. next the MAF is plugged in next the car will stall unless I put my foot on the accelerator. There is furthermore an intermittent popping hermetically sealed coming at idle.