Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to steer off a cliff. had a idle surge misery that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After grating 2-3 oscillate 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. nevertheless had issues. back to the dealer.. this become old he says, it needs a ECU. I did a lot of research on them, and found that its a common burden in the same way as 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 craving to be re-adjusted? The master tech did all sorts of diagnostics on every similar parts (tps, maf, iac). $100-200 all times I undertake it complete the dealer for diagnostics.. on going problems are essentially surcharge 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 get a fast fault locate if you unplug the meter and control the engine without it. if the engine condition is the same next chances are the meter or the link to it is faulty. Its next worth cleaning the MAF sensor wires, as they can acquire coated taking into account dirt on top of get older which then offsets the reading. Use some door cleaner or brake cleaner to spray can onto the wires to separate the dirt upon no account be next to the wires later than anything as they are entirely fragile
Hello the TPS does have an effect upon switching the car into idle mode therefore I'd recommend to create definite the throttle plate is 100% closed and not slightly stranded later carbon. and next adapt the TPS consequently that the IDL fasten is continuous to the E2 fix in imitation of the throttle is closed, and get into circuit taking into account the throttle is just cracked. Don't distress roughly any voltages, the IDL log on is the in point of fact important one.
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