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Yes, once again an idle problem...

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Old 02-04-08, 03:27 PM
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Yes, once again an idle problem...

Hi fellows,

on my S4 Turbo:
I had an Oxygen Sensor error code, did change the sensor.

Then wanna adjust idle for it has always been around 1200 rpm, sometimes lowers to 700 and then goes back to 1000/1200.

Today I warmed up the engine,
removed IC, fitted leds on connector and tuned TPS screw. I wish I had read the FC3S pro DMM check then...
The one led tuning is easy but within half a turn of the screw, quite not precise. If I have to tune it again I'll go for 1K ohms DMM tune.

Then settled back the IC, started the Zenki, turned the BAC adjusted screw to lower the idle... wich was impossible coz the screw was almot fully screwed!!! Unscrew means here higher RPM idle.
Then messed with the idle mixture resistor: the same! It's full anticlockwise - lean - to reach the 850 rpm not so stable! clockwise also rise RPM...

Beside the fact the idle is high the engine runs smooth and have power all the revband. Someone have an idea where to check?
And the O2 sensor still makes error code, maybe the wire is cut somewhere... is the O2 sensor used for idle? I don't think so as there's a mixture edjustable resistor...
Old 02-04-08, 03:36 PM
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Takahashi Ryosuke

 
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The O2 sensor don`t work to the idle speed......

precisly yesterday I wok in my car and see the TPS, knock my O2 sensor, maybe this be a Cut Circuit or something.


the idle speed is behind of Alternator... you can turn a little butterfly!

Is graduate the throtle

sorry x my bad english
Old 02-05-08, 12:19 PM
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Ok, I vote Obama.
Now that's done please help me!
Old 02-22-08, 07:23 PM
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Timing is too important in these things. I now have a headache too.
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