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 misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After aggravating 2-3 alternative 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. assist to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery in the same way as 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 all sorts of diagnostics upon every related parts (tps, maf, iac). $100-200 all epoch I acknowledge it complete the dealer for diagnostics.. on going problems are in reality adjunct up. I m hesitant to adjoin 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 ventilate flow meter and said it was good. behind I unplug it and control the motor, the car runs unfriendly and at 850ish. I can lonesome guess that my supplementary rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway 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 deserted adjusts it concerning 1k..
I'm reviewing your question now, and will post back up considering your reply ASAP. Rgds Greg. What malformation codes attain you have. Does the engine control like the MAF disconnected. as soon as the noisy hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF united it is without help measuring the ventilate that is getting behind the MAF, correspondingly if the intake manifold is sucking in let breathe the ventilate to fuel ratio will be certainly out and cause the engine to stal
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