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 pain that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 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. yet had issues. assist to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem 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 habit to be re-adjusted? The master tech did all sorts of diagnostics on every associated parts (tps, maf, iac). $100-200 all period I agree to it reach the dealer for diagnostics.. on going problems are in fact supplement up. I m unsure to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I did re-check them tho. The master tech did extensive tests upon the air flow meter and said it was good. as soon as I unplug it and manage the motor, the car runs unfriendly and at 850ish. I can abandoned guess that my additional rebuilt ecu has an issue, or the tps needs to be re-adjusted, or somehow my maf has died in the midst of every this. I don't think the tps has that much control in the swing of rpm though? I think it isolated adjusts it approximately 1k..
This could be a large vacuum leak ,with the MAF similar it is lonely measuring the air that is getting behind the MAF, hence if the intake manifold is sucking in freshen the ventilate 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. once carb cleaner vaporizer spray can in the area of the hissing as soon as the engine organization and gone you listen 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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