Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff 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 a pain 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. 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 trouble when this car.. bought a used one.. more trouble. had the original 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 connected parts (tps, maf, iac). 0-200 every grow old I undertake it complete the dealer for diagnostics.. upon going problems are in fact adding up up. I m of two minds to be next to 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 in poor health pump will every result in insufficient fuel inborn delivered to the engine. Might also be worth cleaning out the idle swiftness govern motor / valve as these get clogged happening gone carbon and some brake cleaner washed through helps free things off.
Hello the TPS does have an effect on switching the car into idle mode as a result I'd suggest to make positive the throttle dish is 100% closed and not slightly stranded taking into account carbon. and then adjust the TPS as a result that the IDL stick is continuous to the E2 attach similar to the throttle is closed, and gain access to circuit subsequent to the throttle is just cracked. Don't cause problems approximately any voltages, the IDL admission is the in reality important one.