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 burden that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 2-3 exchange 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. encourage 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 misery past 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 craving to be re-adjusted? The master tech did every sorts of diagnostics upon all similar parts (tps, maf, iac). $100-200 every epoch I put up with it do the dealer for diagnostics.. on going problems are essentially add-on up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will every result in insufficient fuel monster delivered to the engine. Might with be worth cleaning out the idle swiftness rule motor / valve as these acquire clogged taking place with carbon and some brake cleaner washed through helps pardon things off.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you taking place to date on all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms up and is warmed up? oftentimes in engine decree many factors may cause the same symptom(s)
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