Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops 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) on tps, iac and maf and cleaned the TB. After aggravating 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. yet had issues. support to the dealer.. this become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain similar to 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 every sorts of diagnostics upon all partnered parts (tps, maf, iac). 0-200 all time I receive it get the dealer for diagnostics.. on going problems are in reality tally up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
I bought it in July, drove it home from LA (to Utah), and the problems started quickly after I got it home.Any extra encourage you can find the money for is appreciated. I don't know what else to do but say you will it back to the dealer. I know I've got the shop foreman energetic upon it at the dealer, but I nevertheless vibes its pushed to the back up as its antiquated and everyone loses in this situation.
I'm reviewing your question now, and will publish support similar to your respond ASAP. Rgds Greg. What idiosyncrasy codes reach you have. Does the engine control following the MAF disconnected. later the loud hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is only measuring the freshen that is getting as soon as the MAF, hence if the intake manifold is sucking in ventilate the expose to fuel ratio will be enormously out and cause the engine to stal