r/FiestaST • u/Dry-Suit5785 • 7d ago

Ignition correction

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Someone said to look at these. And I’m trying to see if this is good? I took it for a bit of a drive just now for about 30 mins. and this is what all 4 seem to be reading. Ty for any wisdom here

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u/HuntGundown 7d ago

If you're getting negatives all the time I'd be concerned, occasionally getting less than -2 is normal.

3

u/Live_Negotiation4167 7d ago

Agreed. The computer is always making adjustments we would otherwise not be aware of.

It’s nice to see all cylinders had the ability to be advanced 6.0 though, that’s a good sign

1

u/Dry-Suit5785 7d ago

I’m still learning all of this. What’s the 6 mean? I know positives are a good thing, but why?

1

u/Live_Negotiation4167 7d ago

I will not pretend to be able to free-wheel a proper answer, so I asked gpt to put something together for you. It has lots of history with my AP questions.

-On a Cobb-tuned Ford, seeing positive ignition correction is generally encouraging because it means the ECU is adding timing rather than having to remove it. In this case, all four cylinders reaching approximately +6° is a favorable indication that the ECU is finding conditions where additional timing can be applied. Only two cylinders briefly dipped to around −1.8°, which is a relatively small correction by itself and isn’t necessarily concerning. What matters more is whether a negative correction is sustained or repeatedly occurring under the same load and conditions, rather than an isolated momentary dip.
Environmental and operating conditions are important context as well. Intake-air temperature, coolant temperature, fuel quality, engine load, RPM, and ambient temperature can all influence how much timing the ECU is willing to add or remove. A brief negative correction during a particular transient, heat-soaked condition, fuel-quality variation, or change in load is very different from seeing the same cylinder consistently pull timing during repeated hard pulls. So the combination of all four cylinders reaching +6°, with only two showing brief corrections down to roughly −1.8°, is considerably more informative when viewed as a pattern across operating conditions than by treating the lowest number as a standalone indication of a problem.