wan8dan

I have ES300-96'. I thoroughly cleaned the idle air control valve and air intake throttle, idle problem gone, but 2k miles later, low-to-no idle problem re-surfaced when I start the engile. What else could cause it that I haven't looked at?

Thanks
Simon

PFB

With those symptoms you should have an engine code in memory.

If you don't have a code reader than Autozone will do it free of charge

Phil

wan8dan

Thanks for the inputs.

I do have Actron scanner but it does not scan for error code on this idle problem.

2k miles ago, I had the same idle problem (when start engine, idle is so low I have to give gas to run). I opened up the IACV assembly, thoroughly cleaned it (and also cleand the air throttle assembly). It fixed the idle problem. But 2k miles later, idle problem re-surfaced. I don't expect the IACV go dirty just in 2k miles, and cannot find out why problem re-surfaced.

I just checked the engine coolant temperature sensor - it is fine, so this idle isn't coming from that.

I am helpless to find out why this happens again.

eyezack87

iTrader: (4)

Even if you clean the IAC, it can still get "stuck" closed or open. Cleaning it is sort of like a bandaid if the IAC is about to go bad