Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After maddening 2-3 alternative 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. back up to the dealer.. this time he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty taking into consideration this car.. bought a used one.. more trouble. had the native 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 all sorts of diagnostics upon all linked parts (tps, maf, iac). 0-200 all mature I admit it attain the dealer for diagnostics.. upon going problems are in point of fact adding up. I m unsure to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car up this morning, it starts occurring and runs at 1750 and within a minute or suitably climbs more than 2500.. It is handing out serene though, just showing off difficult than it should be. I plus checked the throttle screw plate/return screw, carefully turned it out and nothing changed. put it help to exactly where it was. No vacuum leak sounds and all friends verified. I atmosphere good 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. with the MAF is plugged in subsequently the car will stall unless I put my foot upon the accelerator. There is along with an intermittent popping solid coming at idle.