Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff 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) upon tps, iac and maf and cleaned the TB. After trying 2-3 oscillate 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 era he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship once 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 habit to be re-adjusted? The master tech did all sorts of diagnostics upon all associated parts (tps, maf, iac). $100-200 every become old I agree to it get the dealer for diagnostics.. on going problems are in point of fact addendum 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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Might after that be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a fast malformation locate if you unplug the meter and control the engine without it. if the engine condition is the similar subsequently chances are the meter or the relationship to it is faulty. Its then worth cleaning the MAF sensor wires, as they can acquire coated later dirt exceeding period which then offsets the reading. Use some admittance cleaner or brake cleaner to spray onto the wires to remove the dirt on no account adjoin the wires subsequent to whatever as they are certainly fragile
This could be a large vacuum leak ,with the MAF connected it is forlorn measuring the air that is getting later than the MAF, as a result if the intake manifold is sucking in expose the expose to fuel ratio will be unquestionably out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. afterward carb cleaner spray vaporizer in the area of the hissing in the same way as the engine meting out and afterward you hear the engine stall or rev well ahead there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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