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 misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After aggravating 2-3 alternative 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. support to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty behind 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 need to be re-adjusted? The master tech did every sorts of diagnostics on every combined parts (tps, maf, iac). $100-200 all grow old I acknowledge it get the dealer for diagnostics.. upon going problems are in point of fact totaling up. I m undecided to lie alongside 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 pull off a quick defect locate if you unplug the meter and govern the engine without it. if the engine condition is the similar subsequently chances are the meter or the relationship to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can get coated gone dirt higher than grow old which after that offsets the reading. Use some way in cleaner or brake cleaner to spray onto the wires to cut off the dirt upon no account be next to the wires when all as they are definitely fragile
I don't have any check engine lights unless I unplug the MAF sensor. with the MAF is plugged in subsequently the car will stall unless I put my foot upon the accelerator. There is as a consequence an intermittent popping hermetic coming at idle.
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