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 suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 2-3 interchange 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 mature he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty later than this car.. bought a used one.. more trouble. had the original 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 need to be re-adjusted? The master tech did every sorts of diagnostics upon every connected parts (tps, maf, iac). $100-200 every get older I say you will it accomplish the dealer for diagnostics.. upon going problems are essentially adding up. I m of two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might furthermore be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick irregularity locate if you unplug the meter and direct the engine without it. if the engine condition is the same later chances are the meter or the relationship to it is faulty. Its with worth cleaning the MAF sensor wires, as they can acquire coated behind dirt greater than times which next offsets the reading. Use some door cleaner or brake cleaner to vaporizer onto the wires to separate the dirt on no account touch the wires later everything as they are utterly fragile
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you taking place to date on every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms stirring and is warmed up? oftentimes in engine piece of legislation many factors may cause the same symptom(s)
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