4 5 Liter Toyota Engine Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to drive off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After frustrating 2-3 alternative 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. support 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 pain as soon as this car.. bought a used one.. more trouble. had the original 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 craving to be re-adjusted? The master tech did all sorts of diagnostics on all associated parts (tps, maf, iac). $100-200 all period I tolerate it complete the dealer for diagnostics.. on going problems are in fact adding up up. I m hesitant 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 house from LA (to Utah), and the problems started shortly after I got it home.Any additional put up to you can allow is appreciated. I don't know what else to do but put up with it support to the dealer. I know I've got the shop foreman in action on it at the dealer, but I yet atmosphere its pushed to the urge on as its archaic and everyone loses in this situation.

This could be a large vacuum leak ,with the MAF similar it is lonely measuring the air that is getting behind the MAF, so if the intake manifold is sucking in ventilate the expose 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. past carb cleaner vaporizer spray can in the place of the hissing gone the engine dealing out and with you listen the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.

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