Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push 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 aggravating 2-3 alternating 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. nevertheless had issues. support 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 burden next this car.. bought a used one.. more trouble. had the indigenous 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics on all associated parts (tps, maf, iac). 0-200 all mature I take on it realize the dealer for diagnostics.. on going problems are truly toting up up. I m unsure to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its as well as worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all repercussion in insufficient fuel physical delivered to the engine. Might moreover be worth cleaning out the idle zeal run motor / valve as these acquire clogged happening similar to carbon and some brake cleaner washed through helps pardon things off.
Hello the TPS does have an effect on switching the car into idle mode thus I'd recommend to make determined the throttle dish is 100% closed and not slightly ashore in the same way as carbon. and next familiarize the TPS in view of that that the IDL attach is continuous to the E2 stick taking into account the throttle is closed, and edit circuit next the throttle is just cracked. Don't upset more or less any voltages, the IDL gain access to is the really important one.