Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around 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) on tps, iac and maf and cleaned the TB. After infuriating 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. yet had issues. encourage to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common suffering behind 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 habit to be re-adjusted? The master tech did every sorts of diagnostics on all joined parts (tps, maf, iac). 0-200 every epoch I say yes it attain the dealer for diagnostics.. upon going problems are truly surcharge up. I m unsure to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car up this morning, it starts happening and runs at 1750 and within a minute or hence climbs higher than 2500.. It is giving out serene though, just showing off unconventional than it should be. I also 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 contacts 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. in imitation of the MAF is plugged in after that the car will stall unless I put my foot upon the accelerator. There is moreover an intermittent popping solid coming at idle.