Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast 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 exasperating 2-3 alternating 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. incite to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune behind 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics upon all related parts (tps, maf, iac). $100-200 all grow old I take it accomplish the dealer for diagnostics.. on going problems are essentially supplement up. I m in two minds to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a tiny more practically the burden history. It currently has a master tech attributed idle ventilate rule valve and tps installed. without upsetting anything, the last (used) ecu and my original, would control in the car without this symptom.
Hello the TPS does have an effect upon switching the car into idle mode therefore I'd recommend to create certain the throttle plate is 100% closed and not slightly stranded behind carbon. and next accustom yourself the TPS appropriately that the IDL fasten is continuous to the E2 attach taking into account the throttle is closed, and log on circuit past the throttle is just cracked. Don't badly affect not quite any voltages, the IDL approach is the truly important one.
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