Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public 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 maddening 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. still had issues. support to the dealer.. this time he says, it needs a ECU. I did a lot of research on them, and found that its a common suffering as soon as 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics upon every partnered parts (tps, maf, iac). 0-200 every times I bow to it get the dealer for diagnostics.. upon going problems are in fact accumulation up. I m unsure to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might in addition to be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can pull off a fast deviation find if you unplug the meter and govern the engine without it. if the engine condition is the similar then chances are the meter or the association to it is faulty. Its as well as worth cleaning the MAF sensor wires, as they can acquire coated taking into account dirt over period which later offsets the reading. Use some way in cleaner or brake cleaner to vaporizer onto the wires to cut off the dirt on no account be next to the wires subsequently everything as they are completely fragile
next I begin the car, the engine surges in the works amid 1200 and 2000 rpm encourage and forth. I misused the IAC and the TPS when no bend in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to acclimatize the idle promptness screw to subjugate the rpm and it would retain for a while. Now, the engine is until the end of time surging to the narrowing where I cannot steer it for danger signal of damage to the steer train. Any experienced solution?