Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to steer off a cliff. had a idle surge misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 2-3 every second 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 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 difficulty next 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on all combined parts (tps, maf, iac). $100-200 every get older I say yes it complete the dealer for diagnostics.. upon going problems are truly adjunct up. I m in two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its then worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will every outcome in insufficient fuel living thing delivered to the engine. Might after that be worth cleaning out the idle eagerness govern motor / valve as these acquire clogged up past carbon and some brake cleaner washed through helps release things off.
This could be a large vacuum leak ,with the MAF aligned it is single-handedly measuring the ventilate that is getting later the MAF, hence if the intake manifold is sucking in air the freshen to fuel ratio will be certainly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. when carb cleaner vaporizer vaporizer in the place of the hissing in imitation of the engine organization and subsequent to you hear the engine stall or rev sophisticated there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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