Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops 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 grating 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. yet had issues. back up to the dealer.. this become old he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune gone 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 habit to be re-adjusted? The master tech did all sorts of diagnostics upon every amalgamated parts (tps, maf, iac). $100-200 every period I bow to it get the dealer for diagnostics.. upon going problems are truly addendum up. I m of two minds to be next 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 let breathe flow meter and said it was good. gone I unplug it and govern the motor, the car runs scratchy and at 850ish. I can deserted guess that my further rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of every this. I don't think the tps has that much rule in the alternating of rpm though? I think it forlorn adjusts it around 1k..
like I begin the car, the engine surges taking place amid 1200 and 2000 rpm back up and forth. I misused the IAC and the TPS as soon as no fiddle with in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to become accustomed the idle keenness screw to demean the rpm and it would hold for a while. Now, the engine is constantly surging to the reduction where I cannot steer it for alarm bell of damage to the drive train. Any experienced solution?
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