Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 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. yet had issues. encourage to the dealer.. this time he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty similar to this car.. bought a used one.. more trouble. had the native 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 upon every joined parts (tps, maf, iac). 0-200 all get older I tolerate it do the dealer for diagnostics.. on going problems are in fact tally up. I m unsure to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its moreover 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 bodily delivered to the engine. Might also be worth cleaning out the idle quickness run motor / valve as these get clogged stirring when 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 as a result I'd recommend to make clear the throttle plate is 100% closed and not slightly beached next carbon. and subsequently acclimatize the TPS thus that the IDL stick is continuous to the E2 fix later the throttle is closed, and gate circuit considering the throttle is just cracked. Don't bother very nearly any voltages, the IDL admission is the in reality important one.