Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer 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 substitute 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. still had issues. help to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common suffering past 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics on all combined parts (tps, maf, iac). $100-200 all get older I assume it pull off the dealer for diagnostics.. upon going problems are in point of fact tallying up. I m in two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might afterward be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a quick malfunction locate if you unplug the meter and govern the engine without it. if the engine condition is the same subsequently chances are the meter or the relationship to it is faulty. Its along with worth cleaning the MAF sensor wires, as they can get coated subsequently dirt on top of become old which after that offsets the reading. Use some edit cleaner or brake cleaner to vaporizer onto the wires to remove the dirt on no account adjoin the wires subsequently whatever as they are enormously fragile
This could be a large vacuum leak ,with the MAF related it is unaccompanied measuring the freshen that is getting in the same way as the MAF, in view of that if the intake manifold is sucking in freshen the air to fuel ratio will be enormously out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. taking into account carb cleaner spray can spray can in the area of the hissing next the engine supervision and like you listen the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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