E86 real time engine values.....is there a problem?

[chanlon1]

Scanned the engine tonight and pulled some real time data.
See below. The values for Cylinders 4, 5 & 6 are all negative, compared to the positive values of 1,2 & 3.
Does this imply an issue with injectors, plugs or coil packs on 4, 5 & 6.

Anyone familiar with what these value represent?

thanks

 

[AndyBeech]

I wouldn't go too far down the rabbit hole unless you've got driveability issues. You can drive yourself nuts tbh.
They are all within spec so doesn't seem like an issue to me. I guess this is the same as the smooth running values that show in ISTA.

There is a detailed explanation of what it means in ISTA, but basically it's the quality of the combustion in each cylinder I think, so air, fuel, spark. They have to be read when the engine is at normal operating temperature and at idle. If you really want to play with it you can move spark plugs around and / or coil packs and see if it changes. I'm not overly familiar with the 3.0 engines anymore but vacuum leaks to those particular cylinders, so o-rings etc for fuel and air supply.

Would seem odd it's those specific cylinders in that bank that are different but like I say I really wouldn't worry too much unless you've got issues, or an EML, which you won't have as they are within spec. More useful are your additive (less so) and multiplicative fuel trims which give you a better idea how the engines running (lean or rich).

 

[chanlon1]

I’m having slight fluttering when idle and the revs ever so slightly bounce regardless if the engine is hot or cold. I thought there may be a vacuum leak, but also wasn’t sure if it was injectors or coils. The spark plugs weee new last year. I was looking through all the values to see if I could spot anything amiss, and thought that it looked odd that 3 values were positive and 3 were negative.