Quote:
Originally Posted by MGargano
I haven't touched the idle screw at all. The thing was working perfectly for over a month, right up until I disconnected the battery. I'm not going through this every time I disconnect the battery... plus, even when it's working perfectly, the high idle is now quite loud with the exhaust I have. I'm 99% I'm switching back to the stocker today.
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If you turn the idle set screw out about a turn and a half, all of your problems will go away.
When you leave the screw is the "corolla" position, the yaris ECU adjusts the idle fuel to get a stable idle. This takes time, as the ECU needs to make some pretty big changes. When you adjust the idle set screw to the correct position, the ECU doesn't have to work nearly as hard to get a normal idle, so the ECU doesn't freak out.
The idle rpm fluctuations are a result of the ECU hunting for the right fueling to maintain a steady 600-700 rpm idle in the face of way too much air going through an unadjusted corolla TB.
The P0505 code is the ECU saying..."WTF!!...Why can't I idle at the fuel trims I'm programmed with...something must be wrong!!"
05-21-2009, 02:26 PM
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