Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to steer off a cliff. had a idle surge burden that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After frustrating 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. still had issues. encourage to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common pain later 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 linked parts (tps, maf, iac). $100-200 all times I tolerate it get the dealer for diagnostics.. on going problems are in fact surcharge 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 also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick fault locate if you unplug the meter and rule the engine without it. if the engine condition is the thesame then chances are the meter or the membership to it is faulty. Its after that worth cleaning the MAF sensor wires, as they can acquire coated afterward dirt higher than get older which then offsets the reading. Use some right of entry cleaner or brake cleaner to vaporizer onto the wires to separate the dirt upon no account be adjacent to the wires similar to whatever as they are definitely fragile
Hello the TPS does have an effect on switching the car into idle mode thus I'd suggest to make definite the throttle plate is 100% closed and not slightly high and dry afterward carbon. and after that familiarize the TPS in view of that that the IDL fix is continuous to the E2 fasten in the manner of the throttle is closed, and entrance circuit past the throttle is just cracked. Don't badly affect nearly any voltages, the IDL open is the truly important one.
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