Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to steer off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After maddening 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. urge on to the dealer.. this get older he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery next 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 habit to be re-adjusted? The master tech did every sorts of diagnostics on every united parts (tps, maf, iac). $100-200 every time I receive it pull off the dealer for diagnostics.. on going problems are truly tally up. I m hesitant to be next 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 on the let breathe flow meter and said it was good. with I unplug it and control the motor, the car runs coarse and at 850ish. I can lonely guess that my supplementary rebuilt ecu has an issue, or the tps needs to be re-adjusted, or somehow my maf has died in the midst of every this. I don't think the tps has that much govern in the every other of rpm though? I think it deserted adjusts it just about 1k..
I don't have any check engine lights unless I unplug the MAF sensor. afterward the MAF is plugged in next the car will stall unless I put my foot on the accelerator. There is next an intermittent popping sound coming at idle.
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