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 suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After exasperating 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. still had issues. put up to to the dealer.. this period he says, it needs a ECU. I did a lot of research on them, and found that its a common pain in the manner of 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 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 allow it attain the dealer for diagnostics.. upon going problems are truly adjunct up. I m in two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might plus be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a fast irregularity find if you unplug the meter and direct the engine without it. if the engine condition is the same subsequently chances are the meter or the association to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can get coated as soon as dirt exceeding epoch which subsequently offsets the reading. Use some entrance cleaner or brake cleaner to spray onto the wires to sever the dirt on no account lie alongside the wires in the same way as anything as they are extremely fragile
Hello the TPS does have an effect upon switching the car into idle mode appropriately I'd recommend to make certain the throttle plate is 100% closed and not slightly stuck as soon as carbon. and after that adjust the TPS for that reason that the IDL pin is continuous to the E2 attach following the throttle is closed, and entrance circuit later the throttle is just cracked. Don't badly affect just about any voltages, the IDL admittance is the essentially important one.