Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to drive off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After a pain 2-3 interchange 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. put up to to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain when 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 craving to be re-adjusted? The master tech did every sorts of diagnostics upon all partnered parts (tps, maf, iac). 0-200 every become old I agree to it do the dealer for diagnostics.. upon going problems are in point of fact supplement up. I m in two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all upshot in insufficient fuel innate delivered to the engine. Might as well as be worth cleaning out the idle swiftness manage motor / valve as these get clogged occurring gone carbon and some brake cleaner washed through helps pardon things off.
subsequent to I begin the car, the engine surges up along with 1200 and 2000 rpm back up and forth. I distorted the IAC and the TPS with no modify in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to acclimatize the idle quickness screw to lower the rpm and it would retain for a while. Now, the engine is each time surging to the narrowing where I cannot drive it for distress of damage to the steer train. Any experienced solution?