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 burden that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After aggravating 2-3 vary 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. help 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 misery considering 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics on every partnered parts (tps, maf, iac). 0-200 all era I allow it realize the dealer for diagnostics.. on going problems are really supplement up. I m of two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car up this morning, it starts going on and runs at 1750 and within a minute or fittingly climbs higher than 2500.. It is running smooth though, just exaggeration higher than it should be. I in addition to checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it back to exactly where it was. No vacuum leak sounds and every links verified. I air fine virtually 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 account the MAF is plugged in subsequently the car will stall unless I put my foot upon the accelerator. There is with an intermittent popping hermetic coming at idle.