Need help with fuel trim/vag..
I was reading: https://www.audiforums.com/m_335069/tm.htm which i made as a sticky because is seems very informative and usefull.
Anyway... I have been detonating lately under load, so I was researching on fuel trim etc. It says in that link to check block 32 with vag and that the values for the first 2 fields should be no more than +/- 10%. It says that a value of 0% means that something is wrong, or codes have just been cleared-(which is not the case for me).. My first field reads a steady 1.1% (as if there is no adjustments being made to the A/F mixture at idle. And the 2nd field which represents adjustments under engine load is stuck at 0% while driving. Could this mean that my 02 sensor is shot? I did have a lamda fault code last week that said the signal was too high (forgot fault code # but in bently it mainly pointed to the heated oxygen sensor). And i have had a lean code before which pointed to the MAF, and it was replaced along with the ects. Any ideas??? Still happening. Yes I use premium and correct spark plugs gapped correctly. I also have run injector cleaner though it. |
RE: Need help with fuel trim/vag..
have you checked all the hoses/vacuum pipes for leaks?? have you cleaned the throttle body out?? VAG can throw you off the fault you need to check the basics
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RE: Need help with fuel trim/vag..
ORIGINAL: avant80@2.6 have you checked all the hoses/vacuum pipes for leaks?? have you cleaned the throttle body out?? VAG can throw you off the fault you need to check the basics |
RE: Need help with fuel trim/vag..
when the butterfly valve in the throttle body sticks due to carbon build up more so on the turbo this is where you start;)
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RE: Need help with fuel trim/vag..
in the old days I used the throttle flap/butterfly valve to keep the revs up by turning the throttle stop screw which was required to keep the off roader running before the race:)
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RE: Need help with fuel trim/vag..
ORIGINAL: avant80@2.6 when the butterfly valve in the throttle body sticks due to carbon build up more so on the turbo this is where you start;) |
RE: Need help with fuel trim/vag..
possible but the throttle flap not closing fully could cause the same problem as the ECU sets to 0% when the peddle is off, its all down to electronics and values this is where the system fails
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RE: Need help with fuel trim/vag..
Thanks for your help.. Any experienced vag users got any help for me????
Are there any experienced vag users? |
RE: Need help with fuel trim/vag..
Ive been in the process of checking these diagnostic systems out and im sure you know the recent results ( they only point to a possible area ) without the consideration of how the engine and electrics work and why problems occurs so I vote these new diagnostic tools as very basic
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RE: Need help with fuel trim/vag..
Yes for fault codes you are right. But with measuring blocks in vag com you can look very in depth into electronics. This is what my question is all about.
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