Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to steer off a cliff. had a idle surge misery that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After aggravating 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. yet had issues. put up to 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 pain subsequent to 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics on all amalgamated parts (tps, maf, iac). 0-200 every become old I assume it attain the dealer for diagnostics.. on going problems are truly adding up up. I m hesitant 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 air flow meter and said it was good. taking into consideration I unplug it and rule the motor, the car runs harsh and at 850ish. I can abandoned guess that my extra 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 direct in the every second of rpm though? I think it solitary adjusts it vis--vis 1k..
I'm reviewing your ask now, and will state put up to later than your answer ASAP. Rgds Greg. What oddity codes accomplish you have. Does the engine direct afterward the MAF disconnected. once the noisy hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is lonely measuring the freshen that is getting later than the MAF, correspondingly if the intake manifold is sucking in freshen the air to fuel ratio will be very out and cause the engine to stal