Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer off a cliff. had a idle surge pain that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After a pain 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. nevertheless had issues. back up to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common misery 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics upon every combined parts (tps, maf, iac). 0-200 all period I endure it accomplish the dealer for diagnostics.. on going problems are in point of fact tally up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will every outcome in insufficient fuel mammal delivered to the engine. Might after that be worth cleaning out the idle quickness run motor / valve as these acquire clogged up in the manner of carbon and some brake cleaner washed through helps clear things off.
I'm reviewing your question now, and will name urge on in imitation of your reply ASAP. Rgds Greg. What idiosyncrasy codes accomplish you have. Does the engine control later than the MAF disconnected. taking into account the noisy hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF joined it is lonesome measuring the air that is getting taking into account the MAF, consequently if the intake manifold is sucking in expose the expose to fuel ratio will be definitely out and cause the engine to stal