Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push 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) on tps, iac and maf and cleaned the TB. After maddening 2-3 every second 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. encourage 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 hardship similar to 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics upon all united parts (tps, maf, iac). $100-200 all era I tolerate it realize the dealer for diagnostics.. on going problems are in point of fact additive up. I m undecided to be adjacent to 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 on the freshen flow meter and said it was good. in the same way as I unplug it and manage the motor, the car runs argumentative and at 850ish. I can without help 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 all this. I don’t think the tps has that much control in the vary of rpm though? I think it isolated adjusts it as regards 1k..
I’m reviewing your question now, and will reveal urge on subsequent to your reply ASAP. Rgds Greg. What irregularity codes get you have. Does the engine govern when the MAF disconnected. subsequently the loud hissing hermetically sealed this could be your problem. This could be a large vacuum leak ,with the MAF connected it is only measuring the let breathe that is getting following the MAF, hence if the intake manifold is sucking in air the ventilate to fuel ratio will be definitely out and cause the engine to stal
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