4 Pin Flat To 7 Way Blade Wiring Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After exasperating 2-3 interchange 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 epoch he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble behind 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 obsession 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 agree to it pull off the dealer for diagnostics.. on going problems are essentially totaling up. I m undecided to be adjacent to 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 tell you a little more just about the hardship history. It currently has a master tech attributed idle ventilate control valve and tps installed. without moving anything, the last (used) ecu and my original, would run in the car without this symptom.

taking into account I start the car, the engine surges happening amongst 1200 and 2000 rpm assist and forth. I distorted the IAC and the TPS subsequent to no amend in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adapt the idle zeal screw to degrade the rpm and it would hold for a while. Now, the engine is for ever and a day surging to the narrowing where I cannot steer it for frighten of damage to the steer train. Any experienced solution?

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