Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize 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) upon tps, iac and maf and cleaned the TB. After trying 2-3 substitute 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. incite to the dealer.. this time he says, it needs a ECU. I did a lot of research on them, and found that its a common misery next 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics on all amalgamated parts (tps, maf, iac). 0-200 every mature I take it accomplish the dealer for diagnostics.. upon going problems are really adding together up. I m undecided to touch 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 upon the expose flow meter and said it was good. like I unplug it and run the motor, the car runs brusque and at 850ish. I can single-handedly guess that my new rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of every this. I don't think the tps has that much govern in the substitute of rpm though? I think it deserted adjusts it all but 1k..
I'm reviewing your question now, and will name assist following your answer ASAP. Rgds Greg. What fault codes accomplish you have. Does the engine direct later the MAF disconnected. subsequent to the noisy hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is only measuring the air that is getting afterward the MAF, so if the intake manifold is sucking in freshen the ventilate to fuel ratio will be unconditionally out and cause the engine to stal