Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After infuriating 2-3 interchange 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. support to the dealer.. this period 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 all sorts of diagnostics on all related parts (tps, maf, iac). $100-200 every mature I admit it pull off the dealer for diagnostics.. upon going problems are essentially adding up. I m unsure to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I did re-check them tho. The master tech did extensive tests upon the air flow meter and said it was good. considering I unplug it and run the motor, the car runs sharp and at 850ish. I can without help guess that my extra rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of every this. I don't think the tps has that much govern in the different of rpm though? I think it isolated adjusts it roughly speaking 1k..
once I begin the car, the engine surges going on along with 1200 and 2000 rpm put up to and forth. I tainted the IAC and the TPS later than no fiddle with in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to acclimatize the idle rapidity screw to humiliate the rpm and it would withhold for a while. Now, the engine is continuously surging to the point where I cannot drive it for fear of damage to the steer train. Any experienced solution?
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