Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to drive off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 2-3 alternative 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. put up to to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common problem subsequently 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 habit to be re-adjusted? The master tech did all sorts of diagnostics upon all aligned parts (tps, maf, iac). $100-200 all time I understand it pull off the dealer for diagnostics.. upon going problems are in point of fact adding together up. I m unsure to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I did re-check them tho. The master tech did extensive tests on the air flow meter and said it was good. bearing in mind I unplug it and direct the motor, the car runs severe and at 850ish. I can lonesome guess that my additional rebuilt ecu has an issue, or the tps needs to be re-adjusted, or somehow my maf has died in the midst of all this. I don't think the tps has that much run in the swing of rpm though? I think it unaccompanied adjusts it in relation to 1k..
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you taking place to date upon all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms in the works and is warmed up? oftentimes in engine deed many factors may cause the similar symptom(s)
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