Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to drive off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 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. support 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 suffering once 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 craving to be re-adjusted? The master tech did every sorts of diagnostics on every associated parts (tps, maf, iac). 0-200 all time I resign yourself to it reach the dealer for diagnostics.. on going problems are essentially tallying up. I m undecided to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might next be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a quick irregularity find if you unplug the meter and rule the engine without it. if the engine condition is the similar subsequently chances are the meter or the attachment to it is faulty. Its also worth cleaning the MAF sensor wires, as they can get coated with dirt greater than get older which then offsets the reading. Use some way in cleaner or brake cleaner to spray can onto the wires to cut off the dirt upon no account touch the wires behind everything 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 after that the car will stall unless I put my foot upon the accelerator. There is after that an intermittent popping hermetic coming at idle.