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 frustrating 2-3 alternating 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. back to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common pain like 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 habit to be re-adjusted? The master tech did every sorts of diagnostics upon every connected parts (tps, maf, iac). $100-200 all grow old I acknowledge it realize the dealer for diagnostics.. upon going problems are in fact toting up up. I m of two minds to touch 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 realize a quick aberration find if you unplug the meter and rule the engine without it. if the engine condition is the same then chances are the meter or the connection to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can acquire coated subsequent to dirt higher than become old which next offsets the reading. Use some right of entry cleaner or brake cleaner to vaporizer onto the wires to separate the dirt on no account be adjacent to the wires once all as they are unconditionally fragile
I don't have any check engine lights unless I unplug the MAF sensor. once the MAF is plugged in after that the car will stall unless I put my foot on the accelerator. There is afterward an intermittent popping unassailable coming at idle.
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