Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to steer 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 grating 2-3 substitute 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. urge on to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common misery subsequently 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 craving to be re-adjusted? The master tech did every sorts of diagnostics upon all associated parts (tps, maf, iac). $100-200 every times I recognize it do the dealer for diagnostics.. upon going problems are truly count up. I m in two minds to adjoin 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 reach a quick deformity find if you unplug the meter and control the engine without it. if the engine condition is the thesame after that chances are the meter or the association to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can acquire coated later than dirt over become old which after that offsets the reading. Use some door cleaner or brake cleaner to spray onto the wires to remove the dirt on no account be next to the wires subsequent to all as they are utterly fragile
Hello the TPS does have an effect on switching the car into idle mode as a result I'd recommend to make determined the throttle dish is 100% closed and not slightly ashore similar to carbon. and next accustom yourself the TPS for that reason that the IDL fasten is continuous to the E2 fix behind the throttle is closed, and read circuit subsequently the throttle is just cracked. Don't upset roughly any voltages, the IDL right to use is the in point of fact important one.
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