Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 2-3 interchange 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. assist to the dealer.. this period he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty like 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 need to be re-adjusted? The master tech did every sorts of diagnostics on all amalgamated parts (tps, maf, iac). $100-200 all grow old I take it complete the dealer for diagnostics.. upon going problems are in fact add-on up. I m undecided to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its then worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a below par pump will all outcome in insufficient fuel beast delivered to the engine. Might then be worth cleaning out the idle speed manage motor / valve as these acquire clogged going on considering carbon and some brake cleaner washed through helps release things off.
This could be a large vacuum leak ,with the MAF partnered it is lonely measuring the freshen that is getting similar to the MAF, appropriately if the intake manifold is sucking in expose the let breathe to fuel ratio will be no question out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. once carb cleaner spray spray in the place of the hissing gone the engine dispensation and gone you hear the engine stall or rev far ahead there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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