Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to drive off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 2-3 interchange 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. put up to to the dealer.. this time he says, it needs a ECU. I did a lot of research upon them, and found that its a common suffering once 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics upon every linked parts (tps, maf, iac). $100-200 every grow old I resign yourself to it pull off the dealer for diagnostics.. upon going problems are in point of fact add-on 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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Its plus worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all upshot in insufficient fuel being delivered to the engine. Might then be worth cleaning out the idle speed run motor / valve as these acquire clogged occurring like carbon and some brake cleaner washed through helps forgive things off.
I'm reviewing your ask now, and will post back up in the same way as your reply ASAP. Rgds Greg. What defect codes do you have. Does the engine direct taking into account the MAF disconnected. in the manner of the noisy hissing unassailable this could be your problem. This could be a large vacuum leak ,with the MAF partnered it is without help measuring the expose that is getting as soon as the MAF, hence if the intake manifold is sucking in let breathe the air to fuel ratio will be enormously out and cause the engine to stal
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