Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to drive off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After trying 2-3 different 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. support to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common suffering as soon as 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics upon every united parts (tps, maf, iac). $100-200 every grow old I acknowledge it get 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
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 virtually the trouble history. It currently has a master tech attributed idle air govern valve and tps installed. without disturbing anything, the last (used) ecu and my original, would govern in the car without this symptom.
I’m reviewing your question now, and will broadcast support in the manner of your reply ASAP. Rgds Greg. What defect codes do you have. Does the engine govern taking into account the MAF disconnected. considering the noisy hissing hermetic this could be your problem. This could be a large vacuum leak ,with the MAF linked it is abandoned measuring the ventilate that is getting past the MAF, correspondingly if the intake manifold is sucking in freshen the air to fuel ratio will be unconditionally out and cause the engine to stal
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