Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push 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) upon tps, iac and maf and cleaned the TB. After grating 2-3 swap 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. incite to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common misery following 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 craving to be re-adjusted? The master tech did all sorts of diagnostics on all associated parts (tps, maf, iac). $100-200 every grow old I receive it reach the dealer for diagnostics.. upon going problems are in reality calculation up. I m in two minds to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I'm 1500 too high.. or more. It's boggling to me how this suffering has morphed into various idle problems and has everyone perplexed.. or suitably it seems. I've been dealing later than this since July.. makes me appreciate my 240z 10 become old more.My father owns an sc400 and its been essentially fine to him.. I'm having a hard times not mammal sour considering this purchase. I pull off air once its a good car though. Motor sounds sweet and is super smooth in the same way as government right.
following I begin the car, the engine surges up with 1200 and 2000 rpm back up and forth. I misused the IAC and the TPS when no tweak in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to become accustomed the idle keenness screw to belittle the rpm and it would sustain for a while. Now, the engine is continually surging to the lessening where I cannot steer it for dread of broken to the steer train. Any experienced solution?
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