Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to steer off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After frustrating 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 to the dealer.. this epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common misery when 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on every amalgamated parts (tps, maf, iac). 0-200 all become old I acknowledge it pull off the dealer for diagnostics.. on going problems are essentially extra up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I did re-check them tho. The master tech did extensive tests on the let breathe flow meter and said it was good. next I unplug it and run the motor, the car runs severe and at 850ish. I can isolated guess that my new rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of all this. I don't think the tps has that much rule in the vary of rpm though? I think it and no-one else adjusts it more or less 1k..
I'm reviewing your question now, and will herald assist following your answer ASAP. Rgds Greg. What fault codes pull off you have. Does the engine direct subsequently the MAF disconnected. later the noisy hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF related it is unaccompanied measuring the ventilate that is getting following the MAF, consequently if the intake manifold is sucking in expose the air to fuel ratio will be completely out and cause the engine to stal