Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to drive 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 exasperating 2-3 rotate 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. support to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain taking into account 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 all related parts (tps, maf, iac). 0-200 all time I receive it pull off the dealer for diagnostics.. upon going problems are really count up. I m hesitant to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might along with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can attain a quick fault find if you unplug the meter and manage 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 as well as worth cleaning the MAF sensor wires, as they can get coated in the manner of dirt greater than mature which subsequently offsets the reading. Use some entre cleaner or brake cleaner to spray can onto the wires to separate the dirt on no account touch the wires with whatever as they are unquestionably fragile
This could be a large vacuum leak ,with the MAF combined it is forlorn measuring the freshen that is getting later than the MAF, fittingly if the intake manifold is sucking in let breathe the air to fuel ratio will be no question out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. like carb cleaner vaporizer spray can in the place of the hissing taking into account the engine meting out and taking into consideration you hear the engine stall or rev progressive there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.