[V8] Mixture problem

Ed Kellock ekellock at gmail.com
Sat May 22 16:38:50 PDT 2010


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
 


-----Original Message-----
From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com] On Behalf Of
ville.hiivola at suomi24.fi
Sent: Saturday, May 22, 2010 2:31 PM
To: v8 at audifans.com
Subject: [V8] Mixture problem


Thanks for the replies. Yes, i've tested the temp sender to be in spec 
for ohms. Fuel filter also replaced some months ago.
Yes, i've tried disonnecting the o2 and infact pulsating stops as i 
do that. That's why i replaced the o2, but it was still slow to 
respond. So i guess it has to be the o2 wiring then..?



>----Alkuperäinen viesti----

>Lähettäjä: b.homburg at web.de

>Päivämäärä: 22.05.2010 20:15

>Vastaanottaja:

>Kopio: <v8 at audifans.com>

>Aihe: Re: [V8] Mixture problem

>

>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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>>
>>    
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