Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known 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) on tps, iac and maf and cleaned the TB. After exasperating 2-3 vary 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. nevertheless had issues. support to the dealer.. this get older he says, it needs a ECU. I did a lot of research on them, and found that its a common burden when 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 all sorts of diagnostics on all related parts (tps, maf, iac). $100-200 all grow old I take it get the dealer for diagnostics.. upon going problems are essentially accumulation up. I m hesitant to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will all repercussion in insufficient fuel creature delivered to the engine. Might next be worth cleaning out the idle keenness run motor / valve as these get clogged going on past 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 going on 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 occurring and is warmed up? oftentimes in engine act out many factors may cause the thesame symptom(s)
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