Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to steer 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 irritating 2-3 vary 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 time he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship taking into consideration 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 need to be re-adjusted? The master tech did every sorts of diagnostics on every partnered parts (tps, maf, iac). 0-200 all become old I give a positive response it attain the dealer for diagnostics.. upon going problems are truly adding up. I m in two minds to be next to 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 expose flow meter and said it was good. later than I unplug it and run the motor, the car runs rough and at 850ish. I can lonely guess that my new rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of all this. I don't think the tps has that much run in the substitute of rpm though? I think it single-handedly adjusts it in the region of 1k..
I don't have any check engine lights unless I unplug the MAF sensor. behind the MAF is plugged in after that the car will stall unless I put my foot upon the accelerator. There is with an intermittent popping sealed coming at idle.