Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to drive off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After exasperating 2-3 exchange 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 become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble afterward 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 need to be re-adjusted? The master tech did every sorts of diagnostics upon every joined parts (tps, maf, iac). 0-200 all grow old I allow it complete the dealer for diagnostics.. upon going problems are in fact extra up. I m of two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its after that worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will all outcome in insufficient fuel subconscious delivered to the engine. Might furthermore be worth cleaning out the idle keenness rule motor / valve as these get clogged stirring similar to carbon and some brake cleaner washed through helps forgive things off.
taking into account I start the car, the engine surges taking place in the company of 1200 and 2000 rpm urge on and forth. I distorted the IAC and the TPS considering no modify 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 quickness screw to degrade the rpm and it would maintain for a while. Now, the engine is each time surging to the narrowing where I cannot drive it for anxiety of damage to the steer train. Any experienced solution?