yet another ign correction post

[Coyotemosin]

so my 2014 fiesta st has 60k miles with a muffler and res delete. I have been running stage 1 cobb ots for at least 15k. regular maintenance oil changes at 3k and all. yesterday morning I was running a little late and ran it cold. Not hard mind you i stayed out of boost but below 2k it registered negative 1 for corrections on all cylinders. Afterwards it has been running heavy negative corrections on all cylinders whenever I hit boost. I thought fuel might be an issue so I dumped it down to the stock tune. Still negative corrections. I pulled the plugs and they look fine. Reset the ecu and still having issues. Anyone have any ideas what might be going wrong? thank you for your help.

 

[Ford ST]

Bad gas maybe/ low octane? If available throw one gallon of e85 in.

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[Coyotemosin]

will try a gallon of e85 tomorrow. Any ideas on repercussions if this continues?

 

[CSM]

will try a gallon of e85 tomorrow. Any ideas on repercussions if this continues?

I second the idea to put a gallon or two of E85 and see if that cures it. If that doesn't work I'd wonder if something is triggering the knock sensor, like a vibration or a rattle (I vaguely remember someone saying certain RMMs can trigger knock sensor??)

Also FWIW I ran Cobb OTS tunes for a little while but I noticed it tended to get neg corrections. Ive switched to Dizzy tunes and they are more smooth, more power, and less negative corrections. Highly recommend.

 

[TyphoonFiST]

will try a gallon of e85 tomorrow. Any ideas on repercussions if this continues?

What ever happened here?