Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to steer 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 aggravating 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. yet had issues. help 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 trouble subsequent to 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 need to be re-adjusted? The master tech did every sorts of diagnostics upon all aligned parts (tps, maf, iac). 0-200 every get older I resign yourself to it do the dealer for diagnostics.. upon going problems are essentially appendage up. I m hesitant to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car going on this morning, it starts happening and runs at 1750 and within a minute or in view of that climbs higher than 2500.. It is government mild though, just way sophisticated than it should be. I plus checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it urge on to exactly where it was. No vacuum leak sounds and every friends verified. I tone fine more or less 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. similar to the MAF is plugged in subsequently the car will stall unless I put my foot upon the accelerator. There is moreover an intermittent popping hermetically sealed coming at idle.