Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After maddening 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 taking into account 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics upon every joined parts (tps, maf, iac). $100-200 all times I undertake it get the dealer for diagnostics.. on going problems are truly adding up. I m undecided to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
I did re-check them tho. The master tech did extensive tests upon the ventilate flow meter and said it was good. once I unplug it and manage the motor, the car runs coarse and at 850ish. I can isolated guess that my other rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of every this. I don't think the tps has that much control in the alternative of rpm though? I think it forlorn adjusts it approximately 1k..
I'm reviewing your question now, and will say back afterward your answer ASAP. Rgds Greg. What anomaly codes get you have. Does the engine manage behind the MAF disconnected. taking into account the loud hissing hermetically sealed this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is only measuring the ventilate that is getting in the same way as the MAF, fittingly if the intake manifold is sucking in expose the air to fuel ratio will be unquestionably out and cause the engine to stal
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