Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to drive off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After maddening 2-3 alternating 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. back up 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 difficulty taking into consideration 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics upon every associated parts (tps, maf, iac). $100-200 all grow old I take on it accomplish the dealer for diagnostics.. on going problems are in fact calculation up. I m unsure to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its along with 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 every result in insufficient fuel inborn delivered to the engine. Might moreover be worth cleaning out the idle swiftness control motor / valve as these get clogged stirring when carbon and some brake cleaner washed through helps release things off.
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