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 pain that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After trying 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. nevertheless had issues. incite to the dealer.. this get older he says, it needs a ECU. I did a lot of research on them, and found that its a common misery in the same way as 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics upon all united parts (tps, maf, iac). 0-200 every get older I bow to it complete the dealer for diagnostics.. upon going problems are really additive up. I m undecided to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car in the works this morning, it starts stirring and runs at 1750 and within a minute or hence climbs beyond 2500.. It is executive serene though, just showing off difficult than it should be. I plus checked the throttle screw plate/return screw, carefully turned it out and nothing changed. put it put up to to exactly where it was. No vacuum leak sounds and every connections verified. I feel good about 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. afterward the MAF is plugged in after that the car will stall unless I put my foot upon the accelerator. There is as a consequence an intermittent popping strong coming at idle.