VAG COM misfire/too lean
#1
VAG COM misfire/too lean
Hi All,
It has been a while and finally got the old Audi checked out.
Here is what it told me...
Fuel Trim; Bank 1 (Multi): System too Lean
P1128 - 35-00 - -
Then some misfire stuff
P0300 - 35 -00 - - - Intermittent
P0301 - 35 -00 - - - Intermittent
P0303 - 35 -00 - - - Intermittent
P0304 - 35 -00 - - - Intermittent
Readiness: 0010 1001
The ceck engine light has been on for a while and when I cleaned the MAF it was gone for like 2 weeks now 6 mo later it is still on
I ordered new plugs and fuel filter
If that dosent work then check for leaks, Coil Packs, O2 sensor cleaning/replacement then I am going to need your help! what is your take on this?
It has been a while and finally got the old Audi checked out.
Here is what it told me...
Fuel Trim; Bank 1 (Multi): System too Lean
P1128 - 35-00 - -
Then some misfire stuff
P0300 - 35 -00 - - - Intermittent
P0301 - 35 -00 - - - Intermittent
P0303 - 35 -00 - - - Intermittent
P0304 - 35 -00 - - - Intermittent
Readiness: 0010 1001
The ceck engine light has been on for a while and when I cleaned the MAF it was gone for like 2 weeks now 6 mo later it is still on
I ordered new plugs and fuel filter
If that dosent work then check for leaks, Coil Packs, O2 sensor cleaning/replacement then I am going to need your help! what is your take on this?
#2
RE: VAG COM misfire/too lean
I would start by testing your MAF sensor by running to 6500 in second gear while logging your air mass flow rate in the vagcom. Divide the highest flow rate by .8, and that should be around 170 hp. If it's less, somethings up. My xd45 goes bang louder.
#8
RE: VAG COM misfire/too lean
I don't have my Bently with me, but in the usual germanic way of doing things AUDI reads out basackward. As I recall, "System too lean" actually means that the control system has exceeded the amount that it can lean the mixture in response to the engine running rich.
Made sense to someone.. Anyway, if someone can look up the P1128 trouble shooting procedure in their Bently, I would bet that it would tell you to change the oxygen sensor.
Made sense to someone.. Anyway, if someone can look up the P1128 trouble shooting procedure in their Bently, I would bet that it would tell you to change the oxygen sensor.
#10
RE: VAG COM misfire/too lean
ORIGINAL: david9999
I don't have my Bently with me, but in the usual germanic way of doing things AUDI reads out basackward. As I recall, "System too lean" actually means that the control system has exceeded the amount that it can lean the mixture in response to the engine running rich.
Made sense to someone.. Anyway, if someone can look up the P1128 trouble shooting procedure in their Bently, I would bet that it would tell you to change the oxygen sensor.
I don't have my Bently with me, but in the usual germanic way of doing things AUDI reads out basackward. As I recall, "System too lean" actually means that the control system has exceeded the amount that it can lean the mixture in response to the engine running rich.
Made sense to someone.. Anyway, if someone can look up the P1128 trouble shooting procedure in their Bently, I would bet that it would tell you to change the oxygen sensor.
Apdl, the hp formula is the one where you divide your peak air mass flow rate by 0.8. I got it from the 1.8t troubleshooting guide thread. GL
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10-09-2010 09:49 PM