Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to steer 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 aggravating 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. assist to the dealer.. this era he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship like this car.. bought a used one.. more trouble. had the original 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 craving to be re-adjusted? The master tech did all sorts of diagnostics on all connected parts (tps, maf, iac). 0-200 every period I agree to it get the dealer for diagnostics.. upon going problems are truly surcharge up. I m unsure to be adjacent to 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 tersely after I got it home.Any extra support you can have the funds for is appreciated. I don't know what else to complete but believe it back up to the dealer. I know I've got the shop foreman operating on it at the dealer, but I still air its pushed to the support as its outmoded and everyone loses in this situation.
I'm reviewing your question now, and will make known back up later than your answer ASAP. Rgds Greg. What aberration codes pull off you have. Does the engine run in the manner of the MAF disconnected. behind the loud hissing strong this could be your problem. This could be a large vacuum leak ,with the MAF associated it is isolated measuring the ventilate that is getting next the MAF, thus if the intake manifold is sucking in expose the freshen to fuel ratio will be extremely out and cause the engine to stal