Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to steer off a cliff. had a idle surge burden that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After grating 2-3 swing 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 epoch he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem considering 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 need to be re-adjusted? The master tech did every sorts of diagnostics upon all linked parts (tps, maf, iac). $100-200 every era I endure it pull off the dealer for diagnostics.. upon going problems are in fact accumulation up. I m hesitant to lie alongside 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 appropriately it seems. I've been dealing in the manner of this back July.. makes me appreciate my 240z 10 get older more.My father owns an sc400 and its been in fact fine to him.. I'm having a hard period not creature prickly as soon as this purchase. I get environment in the manner of its a fine car though. Motor sounds cute and is super smooth in imitation of meting out right.
once I start the car, the engine surges going on in the midst of 1200 and 2000 rpm put up to and forth. I untouched the IAC and the TPS gone no modify in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to get used to the idle quickness screw to lower the rpm and it would sustain for a while. Now, the engine is continuously surging to the dwindling where I cannot steer it for fright of damage to the drive train. Any experienced solution?
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