finesse
Registered User
Looking for help on how to use VAGCOM/VCDS to test for boost & vac leaks?
Thanks
Thanks
what should it be if there are no leaks welly mate?
Will be trying this in the morning!
Leggy suggested that at 3000rpm under no load the real time MAF reading should be exactly 10g/s on a car with no leaks....
Does the 3k rev method and block 032 apply to 1.8t A3's too?
Good point! - Cheers, will give it a try.Prawns is an A3 1.8T and it seems to work on his...
Just tried the fuel trims test on mine, before resetting it was -0.4% short term, and -4% long term.
Reset them and the short term didn't move from 0 at all for 5 mins idling. drove 30 miles home, and short term is 0 still, and long term is -3.9%
Does this sound fairly normal to you guys?
If it's pulling out 4% fuel long term, does that imply the map is running rich as standard, and it's possibly got a smallish leak somewhere? or being a generic map, will they all adjust a few % up or down to suit individual cars?
what should my boost gauge be reading on idle with a stage two map and forge mbc set to 1.5 bar 1999 aoudi s3 apy?
its reading -0.7 bar is this correct?
I thought the short term adaptation is considered fine -+ 10%?
Easiest way is to check block 032.
There are two fields in the block, and both belong to fuel trims.
Left hand one is short term adaption, right hand one is long term adaption. Left hand one is the one to look at in this instance.
Make a note of these two figures. Reset the fault codes (even if there are none), as this will clear the fuel trim data back to 0% for both blocks.
Then start the motor and log block 032. If the value in the left hand block steadily climbs to or past the 3-4% area, it's normally a good indication of a leak.
Thanks Tuffty I will try this again tonight, as I balls up logging Blocks 001 & 031 last night. (driving and clicking go on the laptop!)
Cheers Ian
Suggests an air leak...Mine is saying 6.6% idle and 0.0% partial and I'm getting the p1128 fuel bank system lean code