Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to drive off a cliff. had a idle surge burden that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After aggravating 2-3 swap 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. incite to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble gone 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 habit to be re-adjusted? The master tech did all sorts of diagnostics upon every partnered parts (tps, maf, iac). $100-200 all time I bow to it pull off the dealer for diagnostics.. upon going problems are really supplement up. I m hesitant 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 upon the expose flow meter and said it was good. behind I unplug it and run the motor, the car runs rasping and at 850ish. I can without help guess that my additional rebuilt ecu has an issue, or the tps needs to be re-adjusted, or somehow my maf has died in the midst of every this. I don't think the tps has that much manage in the stand-in of rpm though? I think it solitary adjusts it regarding 1k..
I'm reviewing your ask now, and will read out back up bearing in mind your respond ASAP. Rgds Greg. What deviation codes attain you have. Does the engine rule in the same way as the MAF disconnected. behind the noisy hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is forlorn measuring the air that is getting next the MAF, consequently if the intake manifold is sucking in ventilate the air to fuel ratio will be unquestionably out and cause the engine to stal
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