Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to drive off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 2-3 different 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. assist 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 burden next 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on every joined parts (tps, maf, iac). 0-200 every times I believe it attain the dealer for diagnostics.. on going problems are really add-on up. I m unsure 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 suddenly after I got it home.Any extra back up you can meet the expense of is appreciated. I don't know what else to get but believe it encourage to the dealer. I know I've got the shop foreman operating upon it at the dealer, but I yet atmosphere its pushed to the help as its antiquated and everyone loses in this situation.
once I start the car, the engine surges taking place amid 1200 and 2000 rpm help and forth. I changed the IAC and the TPS with no bend in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to familiarize the idle keenness screw to lower the rpm and it would maintain for a while. Now, the engine is forever surging to the tapering off where I cannot steer it for frighten of damage to the drive train. Any experienced solution?