Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to drive off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After aggravating 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 grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune similar to 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 need to be re-adjusted? The master tech did every sorts of diagnostics upon all related parts (tps, maf, iac). $100-200 every time I acknowledge it do the dealer for diagnostics.. upon going problems are in point of fact addendum up. I m of two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its moreover worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not a hundred percent pump will every upshot in insufficient fuel creature delivered to the engine. Might moreover be worth cleaning out the idle rapidity control motor / valve as these acquire clogged going on later carbon and some brake cleaner washed through helps forgive things off.
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