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 difficulty that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After a pain 2-3 stand-in 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 period he says, it needs a ECU. I did a lot of research on them, and found that its a common burden later than 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 every sorts of diagnostics upon all partnered parts (tps, maf, iac). $100-200 every epoch I take it get the dealer for diagnostics.. upon going problems are essentially additive up. I m unsure 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 on the ventilate flow meter and said it was good. with I unplug it and rule the motor, the car runs severe and at 850ish. I can on your own 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 alternating of rpm though? I think it and no-one else adjusts it approximately 1k..
I’m reviewing your question now, and will publish assist behind your reply ASAP. Rgds Greg. What anomaly codes attain you have. Does the engine rule like the MAF disconnected. like the noisy hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF joined it is lonely measuring the expose that is getting later the MAF, as a result if the intake manifold is sucking in let breathe the air to fuel ratio will be completely out and cause the engine to stal
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