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 misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After frustrating 2-3 stand-in 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. help to the dealer.. this era he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble bearing in mind 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 on every joined parts (tps, maf, iac). 0-200 every era I take on it complete the dealer for diagnostics.. on going problems are in reality count up. I m of two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its plus worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will every result in insufficient fuel innate delivered to the engine. Might moreover be worth cleaning out the idle quickness rule motor / valve as these acquire clogged in the works once carbon and some brake cleaner washed through helps free things off.
I don't have any check engine lights unless I unplug the MAF sensor. bearing in mind the MAF is plugged in after that the car will stall unless I put my foot on the accelerator. There is then an intermittent popping hermetically sealed coming at idle.