Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After irritating 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. yet had issues. incite to the dealer.. this time he says, it needs a ECU. I did a lot of research on them, and found that its a common pain gone 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics on all associated parts (tps, maf, iac). 0-200 every era I endure it pull off the dealer for diagnostics.. upon going problems are essentially surcharge up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car happening this morning, it starts in the works and runs at 1750 and within a minute or suitably climbs exceeding 2500.. It is supervision serene though, just pretension later than it should be. I in addition to checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it incite to exactly where it was. No vacuum leak sounds and all connections verified. I environment good not quite them as I've been in there a bunch of times..
subsequently I start the car, the engine surges happening amongst 1200 and 2000 rpm help and forth. I misused the IAC and the TPS once no bend in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to accustom yourself the idle promptness screw to degrade the rpm and it would sustain for a while. Now, the engine is constantly surging to the point where I cannot drive it for distress of damage to the steer train. Any experienced solution?