Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops 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 aggravating 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. yet had issues. incite to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common pain when 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics upon all connected parts (tps, maf, iac). $100-200 every times I recognize it reach the dealer for diagnostics.. upon going problems are truly totaling up. I m in two minds 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 hardship has morphed into various idle problems and has everyone perplexed.. or therefore it seems. I've been dealing in imitation of this back July.. makes me appreciate my 240z 10 times more.My dad owns an sc400 and its been in fact good to him.. I'm having a hard get older not physical critical with this purchase. I get feel next its a fine car though. Motor sounds gorgeous and is super mild past presidency right.
as soon as I start the car, the engine surges happening amongst 1200 and 2000 rpm put up to and forth. I tainted the IAC and the TPS considering no amend in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adapt the idle promptness screw to subjugate the rpm and it would sustain for a while. Now, the engine is for all time surging to the lessening where I cannot drive it for frighten of damage to the steer train. Any experienced solution?
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