Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around 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 bothersome 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. still had issues. back to the dealer.. this era he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain when 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics upon every linked parts (tps, maf, iac). $100-200 every period I understand it pull off the dealer for diagnostics.. upon going problems are in fact tallying up. I m undecided to adjoin 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 suffering has morphed into various idle problems and has everyone perplexed.. or appropriately it seems. I've been dealing similar to this previously July.. makes me appreciate my 240z 10 become old more.My father owns an sc400 and its been truly fine to him.. I'm having a hard era not living thing biting considering this purchase. I accomplish feel with its a fine car though. Motor sounds endearing and is super smooth later than doling out right.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you occurring to date upon all 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 be active many factors may cause the thesame symptom(s)
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