Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to steer off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After infuriating 2-3 interchange 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. assist 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 hardship as soon as 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics on all similar parts (tps, maf, iac). 0-200 all grow old I assume it get the dealer for diagnostics.. on going problems are essentially tallying up. I m of two minds to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its along with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will every result in insufficient fuel beast delivered to the engine. Might furthermore be worth cleaning out the idle speed manage motor / valve as these get clogged up similar to carbon and some brake cleaner washed through helps forgive things off.
Hello the TPS does have an effect on switching the car into idle mode for that reason I'd suggest to make determined the throttle dish is 100% closed and not slightly stuck taking into account carbon. and after that get used to the TPS so that the IDL fix is continuous to the E2 pin subsequently the throttle is closed, and gate circuit taking into account the throttle is just cracked. Don't upset just about any voltages, the IDL edit is the in point of fact important one.