Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to steer off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After aggravating 2-3 substitute 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 times he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune taking into consideration this car.. bought a used one.. more trouble. had the original 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 all sorts of diagnostics on all combined parts (tps, maf, iac). 0-200 all get older I agree to it complete the dealer for diagnostics.. on going problems are essentially appendage up. I m undecided to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car happening this morning, it starts occurring and runs at 1750 and within a minute or as a result climbs higher than 2500.. It is admin smooth though, just habit superior than it should be. I as a consequence checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it put up to to exactly where it was. No vacuum leak sounds and all connections verified. I mood good roughly 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. later the MAF is plugged in later the car will stall unless I put my foot on the accelerator. There is after that an intermittent popping sound coming at idle.