Unstable idle

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Dec 10, 2009 | 12:02 AM

#16

xhomm02

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From: Czech rep.

Quote:

Originally Posted by xhomm02

WTF - today I got CELs:

1) cylinder 2 misfire
2) O2 sensor #1 no activity

After clearing them they did not come again - could the problem be O2 giving wrong signal?

Why does it work fine (stable idle 1000rpm) when I disconnect MAF?

One more thing I have noticed - the timing advance during the f.....g idle jumps from 5 - 20 degrees, even if according to timing map it should be (in that rpm and load) 10degrees. Is the idle timing influenced by any ather "timing correction" map?

Dec 10, 2009 | 12:19 AM

#17

acamus

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From: Lattitude 48.38°, Longitude 17.58°, Altitude 146m = Slovakia, for common dude

Can you post log?

Dec 10, 2009 | 06:58 AM

#18

xhomm02

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From: Czech rep.

Quote:

Originally Posted by acamus

Can you post log?

****... I wanted to make the log and the car runs fine all the day... Really strange.

Dec 10, 2009 | 08:01 AM

#19

atombomb33

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From: Redondo Beach, CA

You need to talk to your tuner.

Dec 12, 2009 | 11:29 AM

#20

xhomm02

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From: Czech rep.

Please take a look at the log (both situations a few minutes one from other):
I marked blue normal idle. Marked with orange there it is very unstable, with rpm fluctuating between 400 and 800. If you take a look at the STFT, could it be caused by O2 sensor reading bad and leanig out the idle making it unstabe?

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