Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to drive 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 infuriating 2-3 stand-in 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 epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble in imitation of 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics on every partnered parts (tps, maf, iac). 0-200 every era I take it get the dealer for diagnostics.. on going problems are essentially surcharge up. I m unsure to be next to 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 do a fast irregularity locate if you unplug the meter and govern the engine without it. if the engine condition is the similar after that chances are the meter or the membership to it is faulty. Its next worth cleaning the MAF sensor wires, as they can get coated in the manner of dirt over era which subsequently offsets the reading. Use some gate cleaner or brake cleaner to spray onto the wires to cut off the dirt upon no account adjoin the wires considering whatever as they are enormously fragile
Hello the TPS does have an effect upon switching the car into idle mode for that reason I'd suggest to make sure the throttle dish is 100% closed and not slightly high and dry similar to carbon. and subsequently become accustomed the TPS for that reason that the IDL fasten is continuous to the E2 stick past the throttle is closed, and contact circuit like the throttle is just cracked. Don't trouble just about any voltages, the IDL get into is the really important one.