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Low RPM Stutter / Hesitation

87txag

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Hoping I can get a little advice / education here. I have a 2021 GT that I bought new off the lot in January of this year. It now has about 2500 miles on it. I have followed Ford's break in recommendations and fuel requirements since day 1. The last couple of weeks it seems to lose power when acclerating at below 2000 rpm. It almost feels like its bad gas. I took it on a road trip (200 miles each way) last week end. I was able to watch the gauges and conclude that it doesn't matter what gear its in or how fast you are going. It does it from idle to 2000 rpm, except from a dead stop. It also seems not to be as bad in the more aggressive drive modes. I decided it was time to get it checked. Doing 60,70, 80 etc and your car doesn't respond when you expect it to is a little nerve racking.

So, off to the dealer last Tuesday. First, tech drove it - yep there's a problem but not sure what it is. Next, pulled P0300 code, Senior tech drove it - still not sure what the issue is. They have brought Ford corporate into the diagonsis and they have a list of things to try. That will happen Monday. Service Advisor said if those don't work, the tech will use some "new technology" where Ford corporate can see what local tech is doing in real time. Whatever - don't care. I have owned Fords for the last 35 years - all trucks - always V8s so, a couple of coyotes. I have never had engine problems but I know how Ford can be dragging ass trying to figure things out.

So, after lots of reading and videos. Here is the list of possible culprits I came up with: bad gas, plugs, coils, or IMRC issue. The IMRC issues seems to have occurred on older model years. Am I missing something to bug the dealer about? Again, just trying to get ahead of the long drawn out process of them trying to figure it out. TIA!
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K4fxd

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Except for bad gas all should throw a code.
 

Cobra Jet

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A P0300 misfire code is a generic "random" misfire code, it could have been anything that tripped it. A sudden change in load or throttle state can create a log event or a twitch in crank or cam sensor events can trigger a random misfire event.

If it were a cylinder event - whether spark plug/coil pack, it wouid have then been a specific misfire code that would be a P0301-P0308 (last # designates the cylinder).

You could swap coil to coil to try to find it, but without a starting point - meaning a specific cylinder misfire code - it's anyones guess at this stage.

This thread may give some enlightenment to Ford's misfire strategies:
https://www.mustang6g.com/forums/threads/good-tech-article-on-ford’s-misfire-strategy.108076/

Also here is a pdf snip from the Ford Shop manual. which is "Coyote" specific. I'm including it because it gives a bigger picture of how to diagnose a misfire events from the generic to the actual cylinder event codes:.
https://www.mustang6g.com/forums/attachments/hd-misfire-detection-pdf.538665/
 
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87txag

87txag

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Thanks CJ
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