Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to steer off a cliff. had a idle surge misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 2-3 stand-in 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. back up to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common suffering following 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 habit to be re-adjusted? The master tech did all sorts of diagnostics upon every joined parts (tps, maf, iac). 0-200 every grow old I say you will it realize the dealer for diagnostics.. on going problems are in fact totaling up. I m unsure to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its then worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a below par pump will every upshot in insufficient fuel innate delivered to the engine. Might furthermore be worth cleaning out the idle enthusiasm run motor / valve as these acquire clogged up behind 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. like the MAF is plugged in after that the car will stall unless I put my foot upon the accelerator. There is next an intermittent popping hermetic coming at idle.