Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce 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) upon tps, iac and maf and cleaned the TB. After infuriating 2-3 every other 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. assist 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 problem once 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 need to be re-adjusted? The master tech did all sorts of diagnostics upon all associated parts (tps, maf, iac). 0-200 all era I receive it realize the dealer for diagnostics.. on going problems are in reality toting up up. I m unsure to adjoin 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 on the freshen flow meter and said it was good. next I unplug it and run the motor, the car runs argumentative and at 850ish. I can single-handedly guess that my further rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of every this. I don't think the tps has that much direct in the substitute of rpm though? I think it unaccompanied adjusts it around 1k..
I don't have any check engine lights unless I unplug the MAF sensor. when the MAF is plugged in then the car will stall unless I put my foot upon the accelerator. There is with an intermittent popping sealed coming at idle.