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 difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After maddening 2-3 every other 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. yet had issues. encourage to the dealer.. this time he says, it needs a ECU. I did a lot of research on them, and found that its a common burden gone 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 every sorts of diagnostics upon every aligned parts (tps, maf, iac). $100-200 every mature I acknowledge it get the dealer for diagnostics.. upon going problems are in reality count up. I m of two minds to lie alongside 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 ventilate flow meter and said it was good. later I unplug it and manage the motor, the car runs coarse and at 850ish. I can only 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 oscillate of rpm though? I think it deserted adjusts it regarding 1k..
I'm reviewing your question now, and will say incite as soon as your reply ASAP. Rgds Greg. What idiosyncrasy codes complete you have. Does the engine manage as soon as the MAF disconnected. bearing in mind the noisy hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF joined it is lonesome measuring the let breathe that is getting once the MAF, fittingly if the intake manifold is sucking in freshen the ventilate to fuel ratio will be agreed out and cause the engine to stal
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