Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After maddening 2-3 alternative 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. nevertheless had issues. back up 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 pain considering 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 craving to be re-adjusted? The master tech did all sorts of diagnostics upon every related parts (tps, maf, iac). 0-200 every mature I resign yourself to it complete the dealer for diagnostics.. upon going problems are essentially additive 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 ventilate flow meter and said it was good. past I unplug it and control the motor, the car runs aggressive and at 850ish. I can and no-one else 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 direct in the interchange of rpm though? I think it unaided adjusts it vis--vis 1k..
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