Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After aggravating 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. still had issues. help 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 like this car.. bought a used one.. more trouble. had the native 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 all sorts of diagnostics on every linked parts (tps, maf, iac). 0-200 every epoch I recognize it accomplish the dealer for diagnostics.. upon going problems are in point of fact extra up. I m in two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its furthermore worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will every outcome in insufficient fuel visceral delivered to the engine. Might along with be worth cleaning out the idle zeal direct motor / valve as these acquire clogged in the works afterward carbon and some brake cleaner washed through helps forgive things off.
I don't have any check engine lights unless I unplug the MAF sensor. similar to the MAF is plugged in next the car will stall unless I put my foot upon the accelerator. There is with an intermittent popping strong coming at idle.