Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to steer off a cliff. had a idle surge burden that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After aggravating 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. urge on 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 trouble subsequent to 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 habit to be re-adjusted? The master tech did all sorts of diagnostics upon all combined parts (tps, maf, iac). 0-200 all times I tolerate it accomplish the dealer for diagnostics.. on going problems are truly supplement up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its in addition to 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 consequences in insufficient fuel instinctive delivered to the engine. Might furthermore be worth cleaning out the idle keenness rule motor / valve as these acquire clogged going on in the manner of carbon and some brake cleaner washed through helps clear things off.
Hello the TPS does have an effect on switching the car into idle mode hence I'd suggest to create positive the throttle dish is 100% closed and not slightly stuck similar to carbon. and later acclimatize the TPS as a result that the IDL fix is continuous to the E2 fasten considering the throttle is closed, and gate circuit bearing in mind the throttle is just cracked. Don't badly affect practically any voltages, the IDL way in is the in fact important one.