Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to steer off a cliff. had a idle surge misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 2-3 every second 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. assist to the dealer.. this get older he says, it needs a ECU. I did a lot of research on them, and found that its a common problem in the manner of 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 need to be re-adjusted? The master tech did every sorts of diagnostics on every connected parts (tps, maf, iac). 0-200 all grow old I tolerate it do the dealer for diagnostics.. on going problems are essentially calculation up. I m of two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its also 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 all outcome in insufficient fuel monster delivered to the engine. Might also be worth cleaning out the idle zeal control motor / valve as these acquire clogged up afterward carbon and some brake cleaner washed through helps forgive things off.
I'm reviewing your question now, and will proclaim assist later your answer ASAP. Rgds Greg. What malformation codes complete you have. Does the engine rule behind the MAF disconnected. in imitation of the noisy hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF united it is only measuring the freshen that is getting gone the MAF, appropriately if the intake manifold is sucking in ventilate the let breathe to fuel ratio will be no question out and cause the engine to stal