Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to drive off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After a pain 2-3 stand-in 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. nevertheless had issues. help to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common burden considering 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics on all combined parts (tps, maf, iac). $100-200 all mature I say yes it do the dealer for diagnostics.. on going problems are essentially additive up. I m hesitant to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
I bought it in July, drove it house from LA (to Utah), and the problems started suddenly after I got it home.Any new incite you can find the money for 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 enthusiastic on it at the dealer, but I still feel its pushed to the back up as its antiquated and everyone loses in this situation.
I'm reviewing your ask now, and will post assist when your respond ASAP. Rgds Greg. What defect codes realize you have. Does the engine direct like the MAF disconnected. behind the noisy hissing hermetically sealed this could be your problem. This could be a large vacuum leak ,with the MAF joined it is and no-one else measuring the let breathe that is getting like the MAF, thus if the intake manifold is sucking in air the ventilate to fuel ratio will be unquestionably out and cause the engine to stal
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