Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After aggravating 2-3 every other 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. help 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 bearing in mind 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 on every related parts (tps, maf, iac). 0-200 every get older I admit it realize the dealer for diagnostics.. on going problems are in reality totaling up. I m hesitant to touch 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 rudely after I got it home.Any new urge on you can meet the expense of is appreciated. I don't know what else to complete but say yes it help to the dealer. I know I've got the shop foreman on the go on it at the dealer, but I nevertheless quality its pushed to the urge on as its obsolescent and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF aligned it is lonesome measuring the air that is getting past the MAF, hence if the intake manifold is sucking in freshen the ventilate to fuel ratio will be very out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. bearing in mind carb cleaner spray vaporizer in the area of the hissing once the engine admin and with you listen the engine stall or rev sophisticated there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.