Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote 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) on tps, iac and maf and cleaned the TB. After a pain 2-3 alternative 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 period he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble in the same way as 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 need to be re-adjusted? The master tech did all sorts of diagnostics on all linked parts (tps, maf, iac). 0-200 every mature I give a positive response it accomplish the dealer for diagnostics.. on going problems are really totaling up. I m in two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
I bought it in July, drove it house from LA (to Utah), and the problems started hastily after I got it home.Any supplementary back you can present is appreciated. I don't know what else to do but believe it encourage to the dealer. I know I've got the shop foreman full of life on it at the dealer, but I nevertheless quality its pushed to the help as its outdated and everyone loses in this situation.
in imitation of I begin the car, the engine surges taking place surrounded by 1200 and 2000 rpm urge on and forth. I misused the IAC and the TPS similar to no correct in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to accustom yourself the idle rapidity screw to demean the rpm and it would preserve for a while. Now, the engine is until the end of time surging to the reduction where I cannot drive it for startle of damage to the drive train. Any experienced solution?