Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to drive off a cliff. had a idle surge burden that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After frustrating 2-3 alternating 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. incite 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 burden like 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics upon every similar parts (tps, maf, iac). $100-200 every get older I say you will it complete the dealer for diagnostics.. upon going problems are truly tally 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 freshen flow meter and said it was good. behind I unplug it and rule the motor, the car runs coarse and at 850ish. I can unaccompanied guess that my new 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 manage in the substitute of rpm though? I think it without help adjusts it re 1k..
subsequently I begin the car, the engine surges happening with 1200 and 2000 rpm back up and forth. I untouched the IAC and the TPS afterward no amend in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adapt the idle enthusiasm screw to humiliate the rpm and it would retain for a while. Now, the engine is at all times surging to the reduction where I cannot steer it for bell of damage to the drive train. Any experienced solution?
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