Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market 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) upon tps, iac and maf and cleaned the TB. After frustrating 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. back up to the dealer.. this epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune behind 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 all sorts of diagnostics upon all aligned parts (tps, maf, iac). $100-200 every mature I recognize it reach the dealer for diagnostics.. upon going problems are in fact additive up. I m undecided to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its in addition to worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will all result in insufficient fuel physical delivered to the engine. Might along with be worth cleaning out the idle eagerness govern motor / valve as these get clogged occurring afterward carbon and some brake cleaner washed through helps pardon things off.
taking into account I begin the car, the engine surges taking place amid 1200 and 2000 rpm assist and forth. I tainted the IAC and the TPS later no fiddle with in symptoms. I have noticed that several Lexus SC’s have this similar issue. Prior to this I would have to acclimatize the idle enthusiasm screw to degrade the rpm and it would support for a while. Now, the engine is for ever and a day surging to the reduction where I cannot steer it for radio alarm of broken to the steer train. Any experienced solution?
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