Been suspecting for a little while my car might have a vacuum leak and wondered if anyone can help with regard Elm327/Forscan/Elmconfig.

I have the reader and those bits of software but i saw something on this page.....

http://www.aa1car.com/library/vacleak.htm

It says "TIP: If you have a scan tool, look at
the Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT) values.
Normal range is plus or minus 8. If the numbers are +10 or higher for
STFT and LTFT, the engine is running LEAN. If you rev the engine to
1500 to 2000 rpm and hold it for a minute or so, and the STFT value
drops back down to a more normal reading, it confirms the engine has a
vacuum leak at idle. If the STFT value does not change much, the lean
fuel condition is more likely a fuel delivery problem (weak fuel pump,
restricted fuel filter, dirty fuel injectors or a leaky fuel pressure
regulator) than a vacuum leak."

Now i have had a look on Forscan and Elm Config but cant find anything about STFT or LTFT . Might anyone know a program for the Focus that would be able to give that info?

Many thanks in advance.

Fuel trim values should be available on the Oscilloscope setting in FORScan I would think, theres loads in there to chose from. I can't check though as mines diesel. If not, any generic software or handheld should read them, I did exactly that to find a vac leak on Dads Mondeo with a handheld.

Many thanks for your reply Tom . Yeah was going to look into the Oscilliscope function but still a newbie with it and only found four options on that section so early next week when i get back home will give it another go.Glad i am barking up the right tree and even more happy you managed to use it to find the leak on your Dads car.Thanks again matey.