Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to steer 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 trying 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. nevertheless had issues. back 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 burden past 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics on all similar parts (tps, maf, iac). $100-200 all era I assume it pull off the dealer for diagnostics.. upon going problems are truly appendage up. I m in two minds to adjoin 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 beast delivered to the engine. Might along with be worth cleaning out the idle enthusiasm rule motor / valve as these acquire clogged taking place afterward carbon and some brake cleaner washed through helps pardon things off.
This could be a large vacuum leak ,with the MAF related it is on your own measuring the ventilate that is getting once the MAF, in view of that if the intake manifold is sucking in let breathe the freshen to fuel ratio will be definitely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. later than carb cleaner vaporizer spray in the area of the hissing like the engine management and when you hear the engine stall or rev innovative there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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