Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to drive off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 2-3 alternating 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. yet had issues. urge on 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 hardship later than 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics upon every amalgamated parts (tps, maf, iac). $100-200 every become old I agree to it complete the dealer for diagnostics.. on going problems are in point of fact adding up. I m unsure to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I'm 1500 too high.. or more. It's boggling to me how this trouble has morphed into various idle problems and has everyone perplexed.. or correspondingly it seems. I've been dealing subsequently this back July.. makes me appreciate my 240z 10 grow old more.My daddy owns an sc400 and its been truly good to him.. I'm having a hard become old not subconscious mordant afterward this purchase. I reach air afterward its a good car though. Motor sounds attractive and is super mild when processing right.
subsequently I start the car, the engine surges going on in the midst of 1200 and 2000 rpm encourage and forth. I misused the IAC and the TPS past no tweak in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adjust the idle eagerness screw to subjugate the rpm and it would maintain for a while. Now, the engine is continuously surging to the lessening where I cannot drive it for distress of broken to the steer train. Any experienced solution?
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