Vag Com Help

[kevinp72]

Hi everyone,

 

Does anybody know where to get the tolerences from for the data on vagcom?

What I mean is, for example, The expected reading for my MAF sensor at tickover is something like 250mg/(something) and mine fluctuates from about 240-260. Is this in spec? Revving the engine provides a pretty good curve on Vag Scope but it does have spikes (comparing expected and actual readings).

I've checked the FAQ's and Ross-Tec and can't seem to find the answer.

I guess Ford/VW is the people who would know but, any suggestions welcomed please.

Very briefly, I have an issue with vibration or possible miss-fire at a fixed engine speed and I am trying to track down the culprit as there are no fault codes which I believe are relevant. I don't know if the spikes on vagscope are the cause of my problems or the result of a problem elsewhere. I had a turbo overboost fault yesterday so It may just be all coked up. A feel a good clean out of EGR Valve and Inlet/Outlet manifolds coming on!

 

Thanks,

 

Kev

 

PS. Great Forum, providing so much help! Thank you all.

[Mirez]

expected reading for my MAF sensor at tickover is something like 250mg/(something) and mine fluctuates from about 240-260. Is this in spec?

 

Assuming its all warmed up then yes, those figures are ok. Spikes are also not uncommon, use VC is logging mode and go for a drive - you can then use excel to chart whats been logged into something useful.

 

I've attached one of my old logs so you can compare rough measurements. For some stupid reason CSV files can't be uploaded (- Insert line about webmaster being a lazy fool here-) so you'll need to rename it from .doc to .csv

LOG-01-003-004-007.doc

[kevinp72]

That's great Mirez, thanks for the reply. That's one less thing for me to worry about.

(sorry for the late reply, been away).

 

Kev