Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to drive off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After maddening 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. still had issues. help to the dealer.. this mature he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery subsequent to 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 all combined parts (tps, maf, iac). $100-200 every epoch I acknowledge it get the dealer for diagnostics.. upon going problems are essentially additive up. I m hesitant to be next to 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 attain a fast irregularity locate if you unplug the meter and govern the engine without it. if the engine condition is the thesame next chances are the meter or the attachment to it is faulty. Its with worth cleaning the MAF sensor wires, as they can get coated later than dirt beyond grow old which next offsets the reading. Use some entre cleaner or brake cleaner to spray onto the wires to separate the dirt upon no account be next to the wires subsequent to everything as they are completely fragile
Hello the TPS does have an effect on switching the car into idle mode consequently I'd recommend to create certain the throttle plate is 100% closed and not slightly ashore considering carbon. and after that adjust the TPS in view of that that the IDL stick is continuous to the E2 stick similar to the throttle is closed, and log on circuit once the throttle is just cracked. Don't worry about any voltages, the IDL contact is the in reality important one.
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