Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 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. nevertheless had issues. support to the dealer.. this get older he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery when 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 every sorts of diagnostics upon every united parts (tps, maf, iac). 0-200 all epoch I acknowledge it get the dealer for diagnostics.. upon going problems are in reality accumulation up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I did re-check them tho. The master tech did extensive tests upon the air flow meter and said it was good. considering I unplug it and rule the motor, the car runs harsh and at 850ish. I can lonely guess that my new rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of every this. I don't think the tps has that much run in the alternating of rpm though? I think it deserted adjusts it vis--vis 1k..
Hello the TPS does have an effect on switching the car into idle mode in view of that I'd suggest to make positive the throttle plate is 100% closed and not slightly stranded behind carbon. and next adjust the TPS consequently that the IDL fasten is continuous to the E2 pin past the throttle is closed, and right of entry circuit considering the throttle is just cracked. Don't trouble very nearly any voltages, the IDL entrance is the in reality important one.