flosssc

iTrader: (1)

Okay, so to start off, my 93 SC300 had the typical smoke/rough idle issue a few weeks back. I replaced my injectors first thinking that was the problem, however, i replaced the capacitors in my ECU which got rid of the smoke and allowed the car to run fine for a day. Then the next day over, my car wont hold the idle and dies out every time i let off the gas pedal. Its starts back up fine every time but doesn't hold idle. Any ideas?

I've also done the fuel ecu bypass before so I don't think that's an issue.

Thanks

DrAtomica

It's possible that your Idle Air Control Valve has gone bad, you can try cleaning it out.

Here's a tutorial:

https://www.clublexus.com/forums/per...rol-valve.html

flosssc

iTrader: (1)

I've actually changed out my IACV completely and the same thing happens

DrAtomica

Does it die out when the car is drive or even park?

flosssc

iTrader: (1)

Both. Give it some gas and it's fine, but the moment I let off, it dies

DrAtomica

Do you have any Check Engine Light (CEL) on ?

Check your spark plugs for their condition, look at your air filter, does it misfire? Check your battery too.