Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to steer 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 frustrating 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. encourage 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 trouble next 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 need to be re-adjusted? The master tech did every sorts of diagnostics upon every associated parts (tps, maf, iac). 0-200 every epoch I acknowledge it accomplish the dealer for diagnostics.. on going problems are in reality appendage 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 shortly after I got it home.Any further encourage you can offer is appreciated. I don't know what else to complete but say you will it incite to the dealer. I know I've got the shop foreman effective on it at the dealer, but I nevertheless setting its pushed to the assist as its pass and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF aligned it is single-handedly measuring the air that is getting later than the MAF, so if the intake manifold is sucking in let breathe the freshen to fuel ratio will be utterly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. subsequent to carb cleaner spray can vaporizer in the place of the hissing taking into consideration the engine presidency and similar to you hear the engine stall or rev superior there is the leak ,could be a bad vacuum hose bad gasket on the manifold.