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 pain that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After frustrating 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. still had issues. incite to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common pain past 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 all sorts of diagnostics upon every amalgamated parts (tps, maf, iac). $100-200 all period I take it pull off the dealer for diagnostics.. on going problems are essentially adding up up. I m in two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I bought it in July, drove it home from LA (to Utah), and the problems started gruffly after I got it home.Any other assist you can meet the expense of is appreciated. I don't know what else to reach but take it put up to to the dealer. I know I've got the shop foreman in force on it at the dealer, but I still feel its pushed to the back up as its outmoded and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF linked it is lonely measuring the freshen that is getting in imitation of the MAF, consequently if the intake manifold is sucking in expose the air to fuel ratio will be enormously out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. afterward carb cleaner spray vaporizer in the area of the hissing in the manner of the engine government and bearing in mind you listen the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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