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 suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After aggravating 2-3 rotate 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 times he says, it needs a ECU. I did a lot of research on them, and found that its a common burden similar to 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on all combined parts (tps, maf, iac). $100-200 every times I put up with it attain the dealer for diagnostics.. on going problems are in point of fact adding up up. I m hesitant 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 difficulty has morphed into various idle problems and has everyone perplexed.. or consequently it seems. I've been dealing as soon as this before July.. makes me appreciate my 240z 10 get older more.My daddy owns an sc400 and its been in point of fact fine to him.. I'm having a difficult mature not brute prickly when this purchase. I attain quality past its a good car though. Motor sounds attractive and is super serene bearing in mind government right.
as soon as I start the car, the engine surges occurring between 1200 and 2000 rpm urge on and forth. I tainted the IAC and the TPS next no bend in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to accustom yourself the idle enthusiasm screw to belittle the rpm and it would hold for a while. Now, the engine is at all times surging to the point where I cannot drive it for distress of damage to the drive train. Any experienced solution?
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