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Ah I see. Yeah I do notice that I get a hesitation when I try to accelerate fast sometimes

Hmm interesting, I have seen you post this information around this site a couple of times which led me to purchase new VCT's which come in sometime next week. I have done pretty much everything I can think of to fix my misfire situation. VCT's would be the very last thing to try. Thank you for...

Unfortunately, I bought the car with most of the mods already installed. The only performance mod I did was the bigger fuel injectors and the 2021 intake manifold along with the tune of course. I could revert those back but it was doing the same thing on the stock manifold. The runners moved by...

Does your misfire on the highway? And yes, keep us updated with what you do

Did you get the 21 intake manifold working correctly? Any more misfires? I do love how the 21 intake manifolds are black compared to the 2018 - 2020 intake manifolds. I also swapped my 2016 intake manifold due to a misfire. My does have a tune for the 2018+ intake manifolds as it is required for...

Any updates on this? I am having something similar happen if you check my previous thread I created?

It's been through 3 shops already and 2 tuners. The mystery still goes on. I hooked up forscan and manually turned on the imrc's And I could see them open and close along with the short fuel trims on both banks go up and down depending on whether they were open or not. (They go up when the...

Well.... I just picked up my car yesterday. And unfortunately they were unable to find out what was causing the issue. They were able to see that it was in fact misfiring on the highway and idling but they checked everything on the car without tearing the engine apart. Good news, compression on...

its in the shop right now, they are running through their own tests. Last I spoke with them, they are going to check the timing and pull out the spark plug for cylinder 4 to check compression of that cylinder since it has the most misfire counts

So far I got CEL with: p0300 p0301 p0302 p0303 p0304 p0305 p0306 And P0420, P0430 at one point but put spacers on the downstream o2 sensors to take care of that

That’s going to be my next step if this next shop still can’t figure it out. I am assuming I will need a new tune for locked out imrcs right?

Yes, it’s been through a local tuner/service shop, ford’s performance shop, and it’s about to go to another shop this week. I am hoping someone can find out what’s wrong with it. I thought clogged cat but ford said no. And tuner said logs all look looked good. I had cat efficiency codes pop up...

That is so true. I originally thought it was the imrcs which is why I replaced the manifold in the first place with a 18+ manifold. But same thing happen on the new one

I was encountering the same misfires with the old intake manifold and the IMRCs were deemed working by a shop and I confirmed that by removing and checking if the rods were all still functional

Hello all! Recently bought a 2016 Ford Mustang Gt Premium with 22k miles (now 28k). Been having misfire issues that showed up a month into ownership after I got more comfortable driving it as it's my first manual car. I have been encountering misfire codes for cylinders 1-6 with cylinder 4...

Over the weekend I found an o2 extension that was burned on my car. I heard bad things about o2 extensions but they are needed when you have long tube headers. The passenger side was the only side that had an extension. I ended up replacing it with a f-150 o2 sensor as they are longer. Thought...

After doing a little bit of research on the battery voltage, it's seems like the mustang's have a smart charging system that only charges the battery under the right conditions. And how did the new parts go? Is it still misfiring? A little update from me, is I took my mustang to the Ford...

My shifting get better as my car warms up too. When it's cold, I have to be really gentle with the clutch otherwise it would be very jerky. It's weird that you mention your battery voltage at 12.5. Mine does the same exact thing. My car doesn't struggle to start though. But I wonder if that may...

Thing is my tuner said everything looks good. So I don't know what it could be. I did buy some F-150 o2 sensors as I heard they are longer. My car has long tube headers and has the extensions on them for the upstream o2 sensors. I heard they can cause issues sometimes. They will get delivered...

It's a manual. And sometimes I do get jerky acceleration when letting go of the gas and pressing the gas again. The car is overall jerky but it could be because I am still learning how to be smooth with the clutch. It does sounds like it backfires (pops) when up shifting gears sometimes or...