Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around 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) on tps, iac and maf and cleaned the TB. After trying 2-3 alternating 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. help to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune bearing in mind 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics upon all united parts (tps, maf, iac). $100-200 all times I understand it attain the dealer for diagnostics.. on going problems are really totaling up. I m hesitant to touch 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 sharply after I got it home.Any new encourage you can meet the expense of is appreciated. I don't know what else to attain but resign yourself to it assist to the dealer. I know I've got the shop foreman dynamic upon it at the dealer, but I still quality its pushed to the back as its obsolete and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF associated it is abandoned measuring the expose that is getting once the MAF, so if the intake manifold is sucking in freshen the ventilate 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. taking into consideration carb cleaner spray can spray in the area of the hissing afterward the engine running and in the manner of you listen the engine stall or rev well ahead there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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