Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market 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 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 become old he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble taking into account this car.. bought a used one.. more trouble. had the original 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 every sorts of diagnostics on all connected parts (tps, maf, iac). $100-200 every epoch I acknowledge it realize the dealer for diagnostics.. on going problems are essentially tally up. I m in two minds 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 little more practically the problem history. It currently has a master tech qualified idle expose govern valve and tps installed. without moving anything, the last (used) ecu and my original, would manage in the car without this symptom.
I don't have any check engine lights unless I unplug the MAF sensor. taking into consideration the MAF is plugged in after that the car will stall unless I put my foot on the accelerator. There is along with an intermittent popping unquestionable coming at idle.
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