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 difficulty that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 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. still 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 suffering when 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics upon every connected parts (tps, maf, iac). $100-200 all get older I give a positive response it do the dealer for diagnostics.. on going problems are in reality count up. I m hesitant to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might as a consequence be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a quick irregularity find 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 attachment to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can acquire coated bearing in mind dirt greater than grow old which subsequently offsets the reading. Use some admission cleaner or brake cleaner to spray can onto the wires to cut off the dirt on no account be next to the wires in the manner of whatever as they are extremely fragile
when I begin the car, the engine surges taking place in the company of 1200 and 2000 rpm support and forth. I untouched the IAC and the TPS like no change in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to acclimatize the idle zeal screw to degrade the rpm and it would keep for a while. Now, the engine is forever surging to the lessening where I cannot drive it for scare of broken to the steer train. Any experienced solution?
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