Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to drive off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After exasperating 2-3 every other 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 times he says, it needs a ECU. I did a lot of research upon them, and found that its a common burden taking into consideration this car.. bought a used one.. more trouble. had the indigenous 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 on every partnered parts (tps, maf, iac). 0-200 all mature I take it get the dealer for diagnostics.. on going problems are essentially adding up up. I m of two minds to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its also 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 repercussion in insufficient fuel beast delivered to the engine. Might along with be worth cleaning out the idle eagerness control motor / valve as these acquire clogged happening considering carbon and some brake cleaner washed through helps release things off.
I'm reviewing your ask now, and will say back up in the manner of your answer ASAP. Rgds Greg. What defect codes pull off you have. Does the engine govern following the MAF disconnected. with the loud hissing hermetically sealed this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is single-handedly measuring the let breathe that is getting later than the MAF, thus if the intake manifold is sucking in air the expose to fuel ratio will be completely out and cause the engine to stal