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 hardship that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After maddening 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. yet had issues. assist to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common burden following 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 all sorts of diagnostics upon all amalgamated parts (tps, maf, iac). 0-200 every mature I endure it attain the dealer for diagnostics.. on going problems are in reality calculation up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its next worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will every result in insufficient fuel brute delivered to the engine. Might moreover be worth cleaning out the idle rapidity govern motor / valve as these get clogged taking place later than carbon and some brake cleaner washed through helps forgive things off.
Hello the TPS does have an effect upon switching the car into idle mode fittingly I'd suggest to make sure the throttle plate is 100% closed and not slightly high and dry with carbon. and then accustom yourself the TPS appropriately that the IDL glue is continuous to the E2 pin subsequent to the throttle is closed, and gain access to 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.