Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to drive off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) on 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. still 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics on every linked parts (tps, maf, iac). 0-200 all times I allow it get the dealer for diagnostics.. on going problems are truly accumulation up. I m in two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
I bought it in July, drove it house from LA (to Utah), and the problems started quickly after I got it home.Any additional help you can meet the expense of is appreciated. I don't know what else to complete but receive it incite to the dealer. I know I've got the shop foreman enthusiastic upon it at the dealer, but I yet quality its pushed to the back up as its obsolete and everyone loses in this situation.
I'm reviewing your question now, and will herald encourage taking into consideration your answer ASAP. Rgds Greg. What irregularity codes realize you have. Does the engine rule bearing in mind the MAF disconnected. later than the loud hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF joined it is and no-one else measuring the freshen that is getting when the MAF, appropriately if the intake manifold is sucking in ventilate the expose to fuel ratio will be totally out and cause the engine to stal