[V8] Mixture problem

Wed May 26 14:01:56 PDT 2010

Thanks Dave. Yes, i did check the fuel pressure to be correct on idle 
with/without vacuum. On plug inspection, i found all the plugs to be 
very similar, all white and none seemed to smell of fuel..

I have yet to use my spark tester, but i was thinking of checking all 
the cylinders with that just in case.

Already i checked MAF signal from the ecu wiring harness to cancel out 
wiring problems, seemed good 2,2 volts on idle and going up smoothly to 
about 5 volts which is in spec acording to alldata.

Water temp signal checked also to be in spec.

I'll check the intake air temp sensor soon too..

One more thing, i have noticed that fuel is propably leaking a small 
amount somewhere, since i get hard starts when it's been sitting over 
night. 3-4 hours sitting, no problem but over night seems to be enough. 
I checked the injectors for leaking when i had them out but i couldn't 
see a leak.. Could the leak be so slight, that it couldn't be seen by 
eye?

I don't think anything else could leak since FPR and fuel pump is 
replaced(check valve inside pump)..

>----Alkuperäinen viesti----

>Lähettäjä: dsaad at icehouse.net

>Päivämäärä: 26.05.2010 21:05

>Vastaanottaja: "v8 Fans"<v8 at audifans.com>

>Aihe: Re: [V8] Mixture problem

>

>It is possible that the O2 sensor is telling you the truth, and the  

>mixture is indeed off.

>That means triple check the other inputs to the ECU that can affect  

>mixture:

>MAF

>intake air temp

>water temp

>

>I believe you already checked fuel pressure - right?

>and is there a possibility of a bad fuel injector - perhaps stuck 
on,  

>or leaking a little? that should show up on a plug inspection.

>Also, is there an ignition problem? A cylinder not firing properly  

>will mess up the mixture correction.

>

>Dave

>

>

>On May 26, 2010, at 2:40 AM, ville.hiivola at suomi24.fi wrote:

>

>> Ok, thanks. That's useful to know. I already tried to add a wire 
to  

>> the

>> 3-wire one, just soldered one to the o2 housing and soldered the 
other

>> end to the o2 ground wire near the ecu. That didn't help though, o2

>> signal still sluggish.

>>

>> Now that checked it again with multimeter, i noticed it sometimes  

>> makes

>> a normal pulsation (crossing 0,5 volts quickly up and down) for a 
few

>> seconds, then going back slow again 0,1-0,8 volts.

>>

>>

>>

>>> ----Alkuperäinen viesti----

>>

>>> Lähettäjä: ekellock at gmail.com

>>

>>> Päivämäärä: 26.05.2010 1:07

>>

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

>>

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

>>

>>>

>>

>>> It a Bosch sensor but for a Ford Aerostar application, which 
gives  

>>> you

>> a

>>

>>> 4-wire sensor with plenty of wire length to do the wiring 
conversion.

>> You

>>

>>> can get a replacement Ford OXS plug that can be spliced to the 
Audi

>> plug end

>>

>>> and then your Aerostar sensor is plug and play in the future.

>>

>>>

>>

>>> Ed

>>

>>>

>>

>>>

>>

>>>

>>

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

>>

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

>> Behalf Of

>>

>>> ville.hiivola at suomi24.fi

>>

>>> Sent: Tuesday, May 25, 2010 3:33 PM

>>

>>> To: v8 at audifans.com

>>

>>> Subject: [V8] Mixture problem

>>

>>>

>>

>>>

>>

>>> I'm sorry, i haven't heard about this one. How is the Aerostar

>> sensor

>>

>>> better than the bosch one?

>>

>>>

>>

>>>> ----Alkuperäinen viesti----

>>

>>>> Lähettäjä: scott_matus at yahoo.com

>>

>>>> Päivämäärä: 24.05.2010 18:27

>>

>>>> Vastaanottaja: "V8"<v8 at audifans.com>

>>

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

>>

>>>>

>>

>>>> Consider doing the Ford connection substitute.  You can use the

>>

>>> Aerostar Ox Sensor and much $$.

>>

>>>

>>

>>>>

>>

>>>

>>

>>>> Scott

>>

>>>

>>

>>>> Too many VAG vehicles

>>

>>>

>>

>>>>

>>

>>>

>>

>>>> ----------- Original message ----------

>>

>>>

>>

>>>>

>>

>>>

>>

>>>> Message: 8

>>

>>>

>>

>>>> Date: Sat, 22 May 2010 17:38:50 -0600

>>

>>>

>>

>>>> From: "Ed Kellock" <ekellock at gmail.com>

>>

>>>

>>

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

>>

>>>

>>

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

>>

>>>

>>

>>>> Message-ID: <CBC02E4DFB87461294A129BB3D8C4CDB at Boonieslap>

>>

>>>

>>

>>>> Content-Type: text/plain;    charset="iso-8859-1"

>>

>>>

>>

>>>>

>>

>>>

>>

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

>> converted

>>

>>> to a

>>

>>>

>>

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

>> back

>>

>>> of the

>>

>>>

>>

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

>>

>>> ground

>>

>>>

>>

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

>> of

>>

>>> the O2

>>

>>>

>>

>>>> sensor threads.

>>

>>>

>>

>>>>

>>

>>>

>>

>>>> Ed

>>

>>>

>>

>>>>

>>

>>>

>>

>>>>

>>

>>>

>>

>>>>

>>

>>>

>>

>>>>

>>

>>>

>>

>>>> _______________________________________________

>>

>>>

>>

>>>> Audifans V8 mailing list

>>

>>>

>>

>>>> Send posts to: mailto:V8 at audifans.com

>>

>>>

>>

>>>> Manage your list connection: http://www.audifans.com/mailman/listinfo/v8

>>

>>>
>>
>>>>
>>>
>>>> You can help keep the audifans site running by shopping at
>>> http://audifans.com/shop/
>>>

>>
>>>>
>>>
>>>>
>>>
>>>
>>> _______________________________________________
>>> Audifans V8 mailing list
>>> Send posts to: mailto:V8 at audifans.com
>>> Manage your list connection: http://www.audifans.com/mailman/listinfo/v8

>>

>>>
>>
>>> You can help keep the audifans site running by shopping at
>>> http://audifans.com/shop/
>>>

>>
>>> No virus found in this incoming message.
>>> Checked by AVG - www.avg.com
>>

>>> Version: 9.0.819 / Virus Database: 271.1.1/2894 - Release Date:
>> 05/25/10
>>> 00:26:00
>>>
>>>
>>
>>
>> _______________________________________________
>> Audifans V8 mailing list
>> Send posts to: mailto:V8 at audifans.com
>> Manage your list connection: http://www.audifans.com/mailman/listinfo/v8

>>

>> You can help keep the audifans site running by shopping at http://audifans.com/shop/

>>

>>
>
>_______________________________________________
>Audifans V8 mailing list
>Send posts to: mailto:V8 at audifans.com
>Manage your list connection: http://www.audifans.com/mailman/listinfo/v8

>

>You can help keep the audifans site running by shopping at http://audifans.com/shop/

>

>