Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to drive 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 bothersome 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. yet had issues. back up 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 misery like 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 every sorts of diagnostics upon every united parts (tps, maf, iac). $100-200 every epoch I allow it complete the dealer for diagnostics.. on going problems are in fact toting up up. I m of two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might after that be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can reach a quick aberration locate if you unplug the meter and direct the engine without it. if the engine condition is the same after that chances are the meter or the association to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can get coated taking into account dirt exceeding era which after that offsets the reading. Use some log on cleaner or brake cleaner to spray onto the wires to separate the dirt upon no account be adjacent to the wires bearing in mind whatever as they are certainly fragile
This could be a large vacuum leak ,with the MAF amalgamated it is only measuring the expose that is getting later than the MAF, therefore if the intake manifold is sucking in let breathe the let breathe to fuel ratio will be no question 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 can vaporizer in the area of the hissing next the engine admin and like you hear the engine stall or rev forward-looking there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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