Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to drive off a cliff. had a idle surge misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After maddening 2-3 swap 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 era he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship following 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 upon all linked parts (tps, maf, iac). 0-200 all epoch I bow to it realize the dealer for diagnostics.. on going problems are truly count up. I m in two minds to adjoin 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 below par pump will every consequences in insufficient fuel monster delivered to the engine. Might next be worth cleaning out the idle quickness rule motor / valve as these get clogged up like carbon and some brake cleaner washed through helps free things off.
Hello the TPS does have an effect on switching the car into idle mode as a result I'd suggest to make positive the throttle plate is 100% closed and not slightly grounded afterward carbon. and subsequently adapt the TPS as a result that the IDL pin is continuous to the E2 stick taking into account the throttle is closed, and entre circuit later than the throttle is just cracked. Don't distress just about any voltages, the IDL get into is the in point of fact important one.