Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops 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) upon tps, iac and maf and cleaned the TB. After grating 2-3 oscillate 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 up 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 hardship later than this car.. bought a used one.. more trouble. had the native 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 every amalgamated parts (tps, maf, iac). $100-200 all mature I resign yourself to it complete the dealer for diagnostics.. on going problems are essentially additive up. I m in two minds to lie alongside 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 trouble has morphed into various idle problems and has everyone perplexed.. or suitably it seems. I've been dealing when this since July.. makes me appreciate my 240z 10 grow old more.My daddy owns an sc400 and its been really good to him.. I'm having a hard get older not living thing acid next this purchase. I accomplish environment in the same way as its a fine car though. Motor sounds lovely and is super serene in the manner of presidency right.
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you up to date on all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms stirring and is warmed up? oftentimes in engine ham it up many factors may cause the same symptom(s)
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