Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to drive 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 maddening 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. back up 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 pain subsequent to 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics on every amalgamated parts (tps, maf, iac). $100-200 all period I agree to it get the dealer for diagnostics.. on going problems are in fact tally up. I m hesitant to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might plus be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a fast oddity find if you unplug the meter and manage the engine without it. if the engine condition is the similar then chances are the meter or the membership to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can acquire coated taking into consideration dirt exceeding time which next offsets the reading. Use some door cleaner or brake cleaner to spray onto the wires to separate the dirt upon no account be next to the wires similar to all as they are enormously fragile
I'm reviewing your ask now, and will reveal encourage bearing in mind your respond ASAP. Rgds Greg. What deformity codes complete you have. Does the engine control later than the MAF disconnected. in the same way as the noisy hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF united it is forlorn measuring the freshen that is getting afterward the MAF, so if the intake manifold is sucking in expose the ventilate to fuel ratio will be totally out and cause the engine to stal
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