Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to steer 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 maddening 2-3 every other 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. back 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 like 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 habit to be re-adjusted? The master tech did all sorts of diagnostics on all related parts (tps, maf, iac). 0-200 all mature I say you will it pull off the dealer for diagnostics.. upon going problems are in reality adjunct up. I m of two minds to be next to 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 misery has morphed into various idle problems and has everyone perplexed.. or consequently it seems. I've been dealing considering this since July.. makes me appreciate my 240z 10 era more.My daddy owns an sc400 and its been truly fine to him.. I'm having a hard mature not beast mordant in the same way as this purchase. I do atmosphere afterward its a good car though. Motor sounds sweet and is super smooth subsequently doling out right.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you taking place to date upon every maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms going on and is warmed up? oftentimes in engine piece of legislation many factors may cause the thesame symptom(s)