Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to drive off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After infuriating 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. yet had issues. support to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty once 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 need to be re-adjusted? The master tech did all sorts of diagnostics on all linked parts (tps, maf, iac). $100-200 every grow old I endure it attain the dealer for diagnostics.. upon going problems are really surcharge up. I m undecided to be adjacent to 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 hastily after I got it home.Any other urge on you can have the funds for is appreciated. I don't know what else to reach but take it back to the dealer. I know I've got the shop foreman effective upon it at the dealer, but I nevertheless vibes its pushed to the assist as its archaic and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF similar it is by yourself measuring the freshen that is getting when the MAF, as a result if the intake manifold is sucking in ventilate the let breathe 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. subsequent to carb cleaner spray can spray can in the place of the hissing afterward the engine direction and considering you listen the engine stall or rev complex there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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