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 misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After frustrating 2-3 rotate 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. put up to 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 trouble behind 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 habit to be re-adjusted? The master tech did every sorts of diagnostics upon every joined parts (tps, maf, iac). 0-200 all times I undertake it get the dealer for diagnostics.. upon going problems are in reality appendage up. I m unsure to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
I did re-check them tho. The master tech did extensive tests upon the air flow meter and said it was good. next I unplug it and direct the motor, the car runs severe and at 850ish. I can forlorn guess that my further rebuilt ecu has an issue, or the tps needs to be re-adjusted, or somehow my maf has died in the midst of every this. I don't think the tps has that much rule in the stand-in of rpm though? I think it and no-one else adjusts it all but 1k..
I don't have any check engine lights unless I unplug the MAF sensor. later the MAF is plugged in next the car will stall unless I put my foot upon the accelerator. There is with an intermittent popping sealed coming at idle.