Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to steer off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After exasperating 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. yet had issues. assist to the dealer.. this mature he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship once 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics on all combined parts (tps, maf, iac). 0-200 all epoch I agree to it reach the dealer for diagnostics.. upon going problems are in reality additive up. I m unsure to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I bought it in July, drove it house from LA (to Utah), and the problems started rapidly after I got it home.Any extra help you can provide is appreciated. I don't know what else to do but undertake it encourage to the dealer. I know I've got the shop foreman full of life on it at the dealer, but I still character its pushed to the urge on as its out of date and everyone loses in this situation.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you up to date on 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 behave many factors may cause the thesame symptom(s)