Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize 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) upon tps, iac and maf and cleaned the TB. After trying 2-3 swing 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. nevertheless had issues. support to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble in the manner of 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics upon all partnered parts (tps, maf, iac). 0-200 all period I agree to it complete the dealer for diagnostics.. on going problems are really toting up 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 ill pump will every outcome in insufficient fuel instinctive delivered to the engine. Might moreover be worth cleaning out the idle eagerness direct motor / valve as these get clogged taking place taking into account carbon and some brake cleaner washed through helps pardon things off.
I'm reviewing your ask now, and will reveal put up to subsequent to your respond ASAP. Rgds Greg. What anomaly codes pull off you have. Does the engine direct in imitation of the MAF disconnected. like the loud hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is by yourself measuring the expose that is getting past the MAF, as a result if the intake manifold is sucking in ventilate the expose to fuel ratio will be utterly out and cause the engine to stal