[V8] Mixture problem

[ville.hiivola at suomi24.fi]

Yes, it's the 3-wire one. Has this conversion improved things for 
those 
who did it, do you know..?
Also fpr is under six months old, and it didn't improve the 
pulsation 

at all when i replaced it.

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>>----Alkuperäinen viesti----

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>>Lähettäjä: ekellock at gmail.com

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>>Päivämäärä: 23.05.2010 2:38

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>>Vastaanottaja: <ville.hiivola at suomi24.fi>, <v8 at audifans.com>

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>>Aihe: RE: [V8]  Mixture problem

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>>

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>>ARe you still using the standard 3-wire sensor?  Some have 
converted 

>to a

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>>4-wire sensor, running the separate ground wire to a bolt on the 
back 

>of the

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>>engine block up by the cruise control diaphram to ensure a solid 

>ground

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>>instead of relying on grounding through the exhaust system by way 
of 

>the O2

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>>sensor threads.

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>>Ed

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>>-----Original Message-----

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>>From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com] On 

>Behalf Of

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>>ville.hiivola at suomi24.fi

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>>Sent: Saturday, May 22, 2010 2:31 PM

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>>To: v8 at audifans.com

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>>Subject: [V8] Mixture problem

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>>Thanks for the replies. Yes, i've tested the temp sender to be in 

>spec 

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>>for ohms. Fuel filter also replaced some months ago.

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>>Yes, i've tried disonnecting the o2 and infact pulsating stops as i 

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>>do that. That's why i replaced the o2, but it was still slow to 

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>>respond. So i guess it has to be the o2 wiring then..?

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>>>----Alkuperäinen viesti----

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>>>Lähettäjä: b.homburg at web.de

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>>>Päivämäärä: 22.05.2010 20:15

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>>>Vastaanottaja:

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>>>Kopio: <v8 at audifans.com>

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>>>Aihe: Re: [V8] Mixture problem

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>>>

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>>>check the wiring to your O2 sensor. Quite possibly that there's a

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>>bad 

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>>>connection there somewhere, mostly bad grounds.

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>>>And  disconnect your O2 sensor  - if the pulsating stops then, you 

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>>have 

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>>>the culprit.....

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>>>ville.hiivola at suomi24.fi wrote:

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>>>> I have a strange issue with the V8, i've been trying to sort out 

>for 

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>>a

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>>>> while now. Since when i got it, the spark plugs have been very 

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>>white

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>>>> (running too lean?), even with new spark plugs. Also i have the

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>>>> infamous pulsating acceleration (not bad, but i can feel it 

>there). 

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>>I

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>>>> get code 00561 - mixture adaptation (add), not right after 

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>>resetting

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>>>> codes but some time after it. I've replaced fpr and fuel pump and

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>>>> tested fuel pressure at idle, pressure seems ok.

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>>>> Also i've tested all the injectors for leaking and flow, also

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>>>> everything looks fine. Many times i've tried to look for vacuum 

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>>leaks

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>>>> by spraying crc or stuff like that, none found.

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>>>>

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>>>> One thing i've taken note off is that o2 signal fluctuating quite

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>>>> slowly, even with the new o2 (about half crosscount per second on

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>>>> idle).

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>>>> No exhaust leaks to effect the o2 sensor. Also i've checked rpm 

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>>sensor

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>>>> and hall sensor signals by a self-made oscilloscope. Seemed to 

>give

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>>>> nice signal on each rpm i tried.

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>>>>

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>>>> I'm beginning to think do i have anything left to check.. Spark 

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>>plug

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>>>> wires look good and have ok resistance. Distributors and caps 
look

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>>>> normal.

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>>>>

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>>>> Could the ecu fail this way..?

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>>>> One weird thing that happened this winter was that trip computer 

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>>went

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>>>> dead and when i looked into it i noticed that the speed signal 

>line 

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>>was

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>>>> grounded somewhere. So i went on and rewired the speed signal 
from

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>>>> instrument cluster to every place it goes acording to the wiring 

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>>chart.

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>>>> Now trip computer works again, but i wonder where actually the 

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>>speed

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>>>> signal was grounded and would it have something to do with this 

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>>problem

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>>>> also..? Perhaps wiring somewhere..?

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>>>> Thanks for any help and sorry for the long post.. ;)

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>>

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