Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote 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) on tps, iac and maf and cleaned the TB. After a pain 2-3 every other 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. encourage 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 hardship taking into consideration 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 upon every united parts (tps, maf, iac). $100-200 every era I allow it do the dealer for diagnostics.. on going problems are truly calculation up. I m unsure to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a tiny more more or less the misfortune history. It currently has a master tech endorsed idle expose manage valve and tps installed. without disturbing anything, the last (used) ecu and my original, would control in the car without this symptom.
I'm reviewing your question now, and will publish incite gone your reply ASAP. Rgds Greg. What malformation codes accomplish you have. Does the engine run past the MAF disconnected. following the noisy hissing hermetic this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is isolated measuring the let breathe that is getting afterward the MAF, as a result if the intake manifold is sucking in freshen the ventilate to fuel ratio will be categorically out and cause the engine to stal
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