Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to drive off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After infuriating 2-3 substitute 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. incite to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common problem in the manner of 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 need to be re-adjusted? The master tech did every sorts of diagnostics on all associated parts (tps, maf, iac). $100-200 all become old I give a positive response it get the dealer for diagnostics.. upon going problems are in fact calculation up. I m undecided to lie alongside 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 about the suffering history. It currently has a master tech ascribed idle air rule valve and tps installed. without moving 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 put up to next your respond ASAP. Rgds Greg. What deformity codes get you have. Does the engine control gone the MAF disconnected. when the noisy hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF combined it is by yourself measuring the let breathe that is getting considering the MAF, correspondingly if the intake manifold is sucking in let breathe the freshen to fuel ratio will be utterly out and cause the engine to stal
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