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 problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 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. still had issues. assist to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune 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 every sorts of diagnostics upon every connected parts (tps, maf, iac). $100-200 all era I acknowledge it attain the dealer for diagnostics.. upon going problems are in reality calculation up. I m unsure to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might next be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a fast malformation find if you unplug the meter and run the engine without it. if the engine condition is the similar next chances are the meter or the association to it is faulty. Its as well as worth cleaning the MAF sensor wires, as they can get coated once dirt exceeding become old which subsequently offsets the reading. Use some entre cleaner or brake cleaner to spray onto the wires to separate the dirt on no account be next to the wires taking into account whatever as they are unquestionably fragile
I'm reviewing your question now, and will declare urge on with your answer ASAP. Rgds Greg. What idiosyncrasy codes accomplish you have. Does the engine direct similar to the MAF disconnected. with the loud hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is forlorn measuring the freshen that is getting considering the MAF, suitably if the intake manifold is sucking in air the expose to fuel ratio will be totally out and cause the engine to stal
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