[V8] Mixture problem

[Bastian Homburg]

check the wiring to your O2 sensor. Quite possibly that there's a bad 
connection there somewhere, mostly bad grounds.
And  disconnect your O2 sensor  - if the pulsating stops then, you have 
the culprit.....






ville.hiivola at suomi24.fi wrote:
> I have a strange issue with the V8, i've been trying to sort out for a
> while now. Since when i got it, the spark plugs have been very white
> (running too lean?), even with new spark plugs. Also i have the
> infamous pulsating acceleration (not bad, but i can feel it there). I
> get code 00561 - mixture adaptation (add), not right after resetting
> codes but some time after it. I've replaced fpr and fuel pump and
> tested fuel pressure at idle, pressure seems ok.
>
> Also i've tested all the injectors for leaking and flow, also
> everything looks fine. Many times i've tried to look for vacuum leaks
> by spraying crc or stuff like that, none found.
>
> One thing i've taken note off is that o2 signal fluctuating quite
> slowly, even with the new o2 (about half crosscount per second on
> idle).
>
> No exhaust leaks to effect the o2 sensor. Also i've checked rpm sensor
> and hall sensor signals by a self-made oscilloscope. Seemed to give
> nice signal on each rpm i tried.
>
> I'm beginning to think do i have anything left to check.. Spark plug
> wires look good and have ok resistance. Distributors and caps look
> normal.
>
> Could the ecu fail this way..?
>
> One weird thing that happened this winter was that trip computer went
> dead and when i looked into it i noticed that the speed signal line was
> grounded somewhere. So i went on and rewired the speed signal from
> instrument cluster to every place it goes acording to the wiring chart.
> Now trip computer works again, but i wonder where actually the speed
> signal was grounded and would it have something to do with this problem
> also..? Perhaps wiring somewhere..?
>
> Thanks for any help and sorry for the long post.. ;)
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