Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After frustrating 2-3 swap 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 up to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common burden following 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics upon all combined parts (tps, maf, iac). 0-200 all epoch I take it do the dealer for diagnostics.. on going problems are in point of fact adding up up. I m of two minds to be adjacent to 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 brusquely after I got it home.Any new assist you can present is appreciated. I don't know what else to reach but undertake it back up to the dealer. I know I've got the shop foreman in action upon it at the dealer, but I nevertheless feel its pushed to the assist as its obsolete and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF partnered it is on your own measuring the freshen that is getting next the MAF, therefore if the intake manifold is sucking in ventilate the ventilate to fuel ratio will be no question out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. considering carb cleaner spray can spray in the place of the hissing following the engine supervision and considering you hear the engine stall or rev forward-thinking there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.