Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public 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 rotate 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. encourage to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common pain later this car.. bought a used one.. more trouble. had the indigenous 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics on every related parts (tps, maf, iac). $100-200 all era I give a positive response it reach the dealer for diagnostics.. on going problems are really add-on up. I m undecided to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
SOME OF THE OWNER'S MANUALS FOR THESE VEHICLES ARE MISSING INSTRUCTIONS THAT PROVIDE A STEP-BY-STEP PROCEDURE, INCLUDING DIAGRAMS, FOR PROPERLY ATTACHING FOR REMOVING THE CIRCUIT BREAKER FROM THE .
I did re-check them tho. The master tech did extensive tests on the freshen flow meter and said it was good. next I unplug it and control the motor, the car runs harsh and at 850ish. I can single-handedly guess that my additional 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 alternating of rpm though? I think it unaided adjusts it something like 1k..
I don't have any check engine lights unless I unplug the MAF sensor. gone the MAF is plugged in then the car will stall unless I put my foot upon the accelerator. There is also an intermittent popping sealed coming at idle.
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