Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to drive off a cliff. had a idle surge burden that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After trying 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. 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 pain once 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics on every similar parts (tps, maf, iac). $100-200 every epoch I agree to it complete the dealer for diagnostics.. on going problems are essentially toting up up. I m of two minds to lie alongside 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 tell you a little more very nearly the difficulty history. It currently has a master tech recognized idle expose direct valve and tps installed. without distressing anything, the last (used) ecu and my original, would govern in the car without this symptom.
I don’t have any check engine lights unless I unplug the MAF sensor. following the MAF is plugged in later the car will stall unless I put my foot on the accelerator. There is next an intermittent popping strong coming at idle.
Image Schematics for 91 mazda wiring diagram
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