Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to steer off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After frustrating 2-3 substitute 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. back to the dealer.. this times he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship similar to 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics on all connected parts (tps, maf, iac). $100-200 every era I acknowledge it reach the dealer for diagnostics.. upon going problems are really supplement up. I m of two minds 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 house from LA (to Utah), and the problems started hastily after I got it home.Any extra help you can pay for is appreciated. I don't know what else to accomplish but say yes it support to the dealer. I know I've got the shop foreman on the go on it at the dealer, but I yet vibes its pushed to the encourage as its obsolescent and everyone loses in this situation.
I'm reviewing your question now, and will post support as soon as your respond ASAP. Rgds Greg. What deformity codes realize you have. Does the engine govern like the MAF disconnected. similar to the noisy hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF associated it is and no-one else measuring the freshen that is getting taking into account the MAF, thus if the intake manifold is sucking in let breathe the freshen to fuel ratio will be certainly out and cause the engine to stal
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