Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present 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) upon tps, iac and maf and cleaned the TB. After frustrating 2-3 substitute 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. yet had issues. incite to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common problem bearing in mind 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics on all associated parts (tps, maf, iac). $100-200 all times I resign yourself to it realize the dealer for diagnostics.. on going problems are in reality additive up. I m unsure to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might along with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a fast fault locate if you unplug the meter and direct the engine without it. if the engine condition is the same then chances are the meter or the link to it is faulty. Its along with worth cleaning the MAF sensor wires, as they can get coated subsequently dirt over era which later offsets the reading. Use some right of entry cleaner or brake cleaner to spray onto the wires to separate the dirt on no account be adjacent to the wires once whatever as they are certainly fragile
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