Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to drive off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After maddening 2-3 stand-in 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. put up to to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune as soon as this car.. bought a used one.. more trouble. had the original 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 every sorts of diagnostics on all associated parts (tps, maf, iac). $100-200 all epoch I consent it realize the dealer for diagnostics.. upon going problems are in point of fact count up. I m of two minds to touch 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 hardship has morphed into various idle problems and has everyone perplexed.. or consequently it seems. I’ve been dealing once this in the past July.. makes me appreciate my 240z 10 time more.My father owns an sc400 and its been in point of fact fine to him.. I’m having a difficult get older not being sharp as soon as this purchase. I get mood similar to its a fine car though. Motor sounds delectable and is super smooth in imitation of running right.
similar to I begin the car, the engine surges going on amid 1200 and 2000 rpm put up to and forth. I changed the IAC and the TPS once no regulate in symptoms. I have noticed that several Lexus SC’s have this thesame issue. Prior to this I would have to adjust the idle zeal screw to lower 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 terror of damage to the drive train. Any experienced solution?
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