Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to steer off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 2-3 interchange 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. nevertheless had issues. back to the dealer.. this time he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble later than 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics on every combined parts (tps, maf, iac). 0-200 all get older I agree to it pull off the dealer for diagnostics.. upon going problems are truly adding up. I m hesitant 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 air flow meter and said it was good. subsequently I unplug it and rule the motor, the car runs coarse and at 850ish. I can by yourself 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 every this. I don't think the tps has that much manage in the vary of rpm though? I think it only adjusts it on the subject of 1k..
I don't have any check engine lights unless I unplug the MAF sensor. taking into account the MAF is plugged in next the car will stall unless I put my foot upon the accelerator. There is afterward an intermittent popping unquestionable coming at idle.