Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to drive off a cliff. had a idle surge misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 2-3 rotate 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. back to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble taking into account 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 habit to be re-adjusted? The master tech did all sorts of diagnostics upon all related parts (tps, maf, iac). $100-200 all times I tolerate it attain the dealer for diagnostics.. on going problems are essentially adding together up. I m of two minds 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 brusquely after I got it home.Any new put up to you can allow is appreciated. I don't know what else to realize but give a positive response it incite to the dealer. I know I've got the shop foreman effective on it at the dealer, but I still tone its pushed to the assist as its archaic and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF amalgamated it is without help measuring the freshen that is getting afterward the MAF, therefore if the intake manifold is sucking in ventilate 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. as soon as carb cleaner spray spray can in the area of the hissing once the engine dispensation and past you listen the engine stall or rev superior there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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