Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 2-3 rotate 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. support to the dealer.. this era he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune similar to 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 partnered parts (tps, maf, iac). 0-200 all time I tolerate it accomplish the dealer for diagnostics.. on going problems are in point of fact count up. I m unsure 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 on the let breathe flow meter and said it was good. subsequently I unplug it and control the motor, the car runs argumentative and at 850ish. I can unaccompanied guess that my extra rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of every this. I don't think the tps has that much direct in the rotate of rpm though? I think it unaided adjusts it around 1k..
I'm reviewing your ask now, and will name support in the manner of your respond ASAP. Rgds Greg. What malformation codes do you have. Does the engine govern considering the MAF disconnected. once the loud hissing hermetic this could be your problem. This could be a large vacuum leak ,with the MAF united it is abandoned measuring the expose that is getting later than the MAF, as a result if the intake manifold is sucking in ventilate the expose to fuel ratio will be no question out and cause the engine to stal