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 misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 2-3 substitute 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. support 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 hardship taking into consideration 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics on every aligned parts (tps, maf, iac). 0-200 every grow old I give a positive response it accomplish the dealer for diagnostics.. upon going problems are in point of fact accumulation up. I m undecided to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will every outcome in insufficient fuel instinctive delivered to the engine. Might as a consequence be worth cleaning out the idle readiness control motor / valve as these acquire clogged in the works behind 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 in view of that I'd recommend to make definite the throttle dish is 100% closed and not slightly ashore once carbon. and then accustom yourself the TPS so that the IDL fix is continuous to the E2 pin with the throttle is closed, and entry circuit behind the throttle is just cracked. Don't cause problems about any voltages, the IDL right of entry is the in reality important one.