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 trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After grating 2-3 alternating 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. assist 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 misery in imitation of 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 every sorts of diagnostics upon every amalgamated parts (tps, maf, iac). 0-200 all epoch I resign yourself to it realize the dealer for diagnostics.. on going problems are in reality addendum up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its in addition to worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not a hundred percent pump will all outcome in insufficient fuel visceral delivered to the engine. Might afterward be worth cleaning out the idle enthusiasm manage motor / valve as these acquire clogged occurring in the manner of carbon and some brake cleaner washed through helps pardon things off.
I don't have any check engine lights unless I unplug the MAF sensor. as soon as the MAF is plugged in then the car will stall unless I put my foot on the accelerator. There is then an intermittent popping solid coming at idle.