Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 2-3 vary 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. back up to the dealer.. this era he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem when 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics upon every united parts (tps, maf, iac). $100-200 every times I agree to it complete the dealer for diagnostics.. on going problems are essentially adding together up. I m undecided to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might in addition to be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a fast aberration locate if you unplug the meter and manage the engine without it. if the engine condition is the same subsequently chances are the meter or the association to it is faulty. Its in addition to worth cleaning the MAF sensor wires, as they can get coated as soon as dirt higher than epoch which next offsets the reading. Use some right to use cleaner or brake cleaner to spray onto the wires to surgically remove the dirt upon no account be next to the wires when anything as they are definitely fragile
I'm reviewing your ask now, and will herald back up in the manner of your answer ASAP. Rgds Greg. What fault codes complete you have. Does the engine govern taking into consideration the MAF disconnected. taking into account the noisy hissing sound this could be your problem. This could be a large vacuum leak ,with the MAF combined it is without help measuring the expose that is getting afterward the MAF, correspondingly if the intake manifold is sucking in expose the let breathe to fuel ratio will be extremely out and cause the engine to stal
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