Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to steer off a cliff. had a idle surge misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After frustrating 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. nevertheless had issues. support to the dealer.. this epoch he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune in the same way as this car.. bought a used one.. more trouble. had the native 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics upon all associated parts (tps, maf, iac). $100-200 every era I resign yourself to it pull off the dealer for diagnostics.. on going problems are in fact toting up up. I m in two minds to touch 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 more or less the problem history. It currently has a master tech recognized idle ventilate rule valve and tps installed. without disturbing anything, the last (used) ecu and my original, would run in the car without this symptom.
I don’t have any check engine lights unless I unplug the MAF sensor. in the manner of the MAF is plugged in subsequently the car will stall unless I put my foot upon the accelerator. There is afterward an intermittent popping solid coming at idle.
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