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I am looking for help with my timing advance. I have just got the Torque app and am reading the data from my Ford Fiesta WS Petrol 1.6L 2010 model. This is the graph here. As you can see, RPM is constant (along with a number of other variables) but the timing advance is jumping up and down. Is this normal behaviour?

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Edited:

I was driving yesterday with cruise control and watching the engine timing advance, and it is dropping 15 degrees almost instantly then going back to the value it was. I feel a gentle jerk when this happens. This is the image of this log while it was happening. Is this normal?

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    Welcome to Motor Vehicle Maintenance & Repair! I'm not entirely positive, but would bet this is normal behavior. Since all of this is 1:1 and the graph is sitting in the 7-10° advance, that really isn't a lot of variation. The computer could be easily directing this to happen and I wouldn't think twice about it. There are others on here who are more expert than I on reading this stuff, so I'll leave them to answer. – Pᴀᴜʟsᴛᴇʀ2 Oct 15 '18 at 13:29
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    This is normal. You can take a look at a couple other Ford 1.6l at pidfusion.net/datalogs/Ford – Milison Oct 15 '18 at 17:13
  • Looking at Ford 1.6l on pidfusion.net/datalogs/Ford does not show any logs for a Ford Fiesta at idle. All logs are with the accelerator being pressed down, then released, then repeated. – John Nov 2 '18 at 23:57
  • @John - When on pidfusion.net, keep an eye on the range of each graph. Although it appears the accelerator is pressed repeatedly, the range is only less than 1%, and I would blame that on slight voltage fluctuation. The "Complete line Graph" page toward the bottom also has a graph of the PIDs in question. There the legend is interactive so you can select what to mute out and also a box zoom tool. You should be able to see that the throttle was not pressed repeatedly at the beginning of the log. Since you have Torque pro, why not upload a log of your own and then post a link to it? – Milison Nov 17 '18 at 5:17

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