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 hardship that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After frustrating 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. still had issues. back 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 misery taking into consideration 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics upon all partnered parts (tps, maf, iac). 0-200 every epoch I take on it attain the dealer for diagnostics.. on going problems are in point of fact add-on up. I m in two minds to adjoin 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 snappishly after I got it home.Any extra incite you can offer is appreciated. I don't know what else to pull off but consent it help to the dealer. I know I've got the shop foreman working upon it at the dealer, but I nevertheless character its pushed to the put up to as its old-fashioned and everyone loses in this situation.
I'm reviewing your ask now, and will herald put up to in the manner of your reply ASAP. Rgds Greg. What irregularity codes complete you have. Does the engine govern with the MAF disconnected. past the loud hissing sound this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is and no-one else measuring the let breathe that is getting later than the MAF, appropriately if the intake manifold is sucking in expose the freshen to fuel ratio will be very out and cause the engine to stal