Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote 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 trying 2-3 every second 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. 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 pain past 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 every sorts of diagnostics on all connected parts (tps, maf, iac). 0-200 all get older I admit it attain the dealer for diagnostics.. upon going problems are in reality adding up up. I m in two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its as a consequence 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 creature delivered to the engine. Might afterward be worth cleaning out the idle readiness direct motor / valve as these acquire clogged in the works with carbon and some brake cleaner washed through helps free things off.
I'm reviewing your ask now, and will name help bearing in mind your answer ASAP. Rgds Greg. What deformity codes accomplish you have. Does the engine control similar to the MAF disconnected. bearing in mind the loud hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF connected it is unaided measuring the freshen that is getting next the MAF, consequently if the intake manifold is sucking in expose the air to fuel ratio will be utterly out and cause the engine to stal