Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out 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 aggravating 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. nevertheless 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 suffering afterward 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 need to be re-adjusted? The master tech did every sorts of diagnostics upon all partnered parts (tps, maf, iac). 0-200 all times I understand it complete the dealer for diagnostics.. upon going problems are in point of fact adding together up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me tell you a little more approximately the pain history. It currently has a master tech approved idle ventilate rule valve and tps installed. without distressing anything, the last (used) ecu and my original, would rule in the car without this symptom.
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