Anyone know the VAG-COM group # for Air/Fuel ratio? Or do I have to calculate it from O2? (more)
09-16-2002, 09:05 PM
#1
AudiWorld Senior Member
Thread Starter
Join Date: Jul 2002
Posts: 1,067
Likes: 0
Received 0 Likes
on
0 Posts
Anyone know the VAG-COM group # for Air/Fuel ratio? Or do I have to calculate it from O2? (more)
I have been getting the "Long term:system too lean" CEL for a couple of weeks now and I think I have tracked it to a bad MAF.
I just replaced the original "non code" DV with the "N" code DV and cleared the ever-present CEL...OMFG this thing is fast. Drove for about a mile with a big smile on my face then the car went back to "dog mode". Drove for another 30 min and the CEL came back on. I get decent power at partial throttle and it feels like it is running out of breath at WOT.
I have noticed this 3 times now after clearing the CEL...Car is fantastic for about 5 minutes and then it goes to crap and about 30 minutes later the CEL comes back on. I've cleaned the MAF twice with no luck. I think the computer is adapting to the bad MAF readings which is causing the power to drop off and the cylinders to run lean... At first I thought it might be leaking boost throught the crappy DV but I have the same symptoms with the brand new DV and logged .74 bar (I'm unchipped), so I know I'm getting boost.
Am I on the right track????
Also, how the hell do you connect the vaccum hose to the top of OEM DV??? The clamp that clairparts sent me for the hose wouldn't fit until I bent it into a perfect circle!! So much for good clamping force...I bought some small band clamps like the ones on the other two hoses but I don't think they will fit in the recess on the top of the DV. Am I missing something or is the OD of my vaccum hose too big?
Thanks everyone!!
I just replaced the original "non code" DV with the "N" code DV and cleared the ever-present CEL...OMFG this thing is fast. Drove for about a mile with a big smile on my face then the car went back to "dog mode". Drove for another 30 min and the CEL came back on. I get decent power at partial throttle and it feels like it is running out of breath at WOT.
I have noticed this 3 times now after clearing the CEL...Car is fantastic for about 5 minutes and then it goes to crap and about 30 minutes later the CEL comes back on. I've cleaned the MAF twice with no luck. I think the computer is adapting to the bad MAF readings which is causing the power to drop off and the cylinders to run lean... At first I thought it might be leaking boost throught the crappy DV but I have the same symptoms with the brand new DV and logged .74 bar (I'm unchipped), so I know I'm getting boost.
Am I on the right track????
Also, how the hell do you connect the vaccum hose to the top of OEM DV??? The clamp that clairparts sent me for the hose wouldn't fit until I bent it into a perfect circle!! So much for good clamping force...I bought some small band clamps like the ones on the other two hoses but I don't think they will fit in the recess on the top of the DV. Am I missing something or is the OD of my vaccum hose too big?
Thanks everyone!!
09-16-2002, 09:42 PM
#2
I didn't see it in this list but I'm not sure if this is complete for us
Andy@Ross-Tech posted this last week when I was looking for blocks.<ul><li><a href="http://andy.swankmonkey.com/vwfiles/datablocks.html">http://andy.swankmonkey.com/vwfiles/datablocks.html</a</li></ul>
09-16-2002, 11:25 PM
#3
Junior Member
Join Date: Aug 2000
Posts: 1,005
Likes: 0
Received 0 Likes
on
0 Posts
Group#33 if I'm not mistaken. It displays the O2 sensors' voltage. Shouldn't get below 0.7 at WOT.
The lower the voltage the leaner the mixture. AT that list John posted below, it is group#33 for pre-cat O2 sensor (O2S1) and group#37 for post-cat O2 sensor (O2S2), but mine displays both at group#33.
09-17-2002, 06:03 AM
#4
Audiworld Premium Sponsor
Join Date: Mar 2002
Posts: 1,907
Likes: 0
Received 0 Likes
on
0 Posts
Try this spreadsheet
<ul><li><a href="http://home.earthlink.net/~cogent001/vw/air_fuel_EXAMPLE.xls">http://home.earthlink.net/~cogent001/vw/air_fuel_EXAMPLE.xls</a</li></ul>
__________________
Andy
Andy
Thread
Thread Starter
Forum
Replies
Last Post
TTGram
TT (Mk1) Discussion
4
11-02-2004 08:12 AM
Random CEL, CEL has been on for a couple of days now and I have VAGed the car several times (more)..
mullarks
S4 / RS4 (B5 Platform) Discussion
4
08-03-2004 02:22 PM
T-28-Quattro de VT
A4 (B5 Platform) Discussion
6
12-30-2002 04:28 PM
