Engine Misfiring Issues Right After Service

[Bu3amraa]

Hey guys, so this will be a bit long please bear with me.

I purchased my Bronco 2022 Wildtrak on Feb 2023.

Towards the end of February 2024 I took it for its 20k KM service at the dealer. I left that day and everything was fine, then 2-3 days later the car was shaking when I would turn it on and the check engine light would start blinking. I drove the car to the dealer (official service center) since it was less than 5 mins away from where the car was at the time. They received it and a week later they called me letting me know it was ready for pick up. When I asked what happened, they said they replaced cylinder number 5 and it was done under warranty. At the time I brushed it off as a one time thing and move on with my life.

2 days ago I took the car to the dealer to preform the scheduled 50k KM service. At this point I've driven around 37k KM on my car but I am doing the services based on their time intervals rather than distance travelled to make sure the car stays in proper shape. I received my car on the same day and everything was great. Today morning as I was turning on the ignition I started to feel the car shake/vibrate again very similarly to how it did last time. I waited a bit and the check engine light started blinking again. I called the dealership and they sent a tow truck to pick it up and take it for checking since it's still under warranty. They still have not gotten back to me with what is the issue this time but I suspect something similar.

So I wanted to ask you guys, isn't it weird that this engine misfiring has happened right after service twice? could the dealership be messing with the car somehow or am I being paranoid? Should I just let them fix it again under warranty or should I escalate things? I am worried that after the warranty is over if such a thing happens again I would be forced to pay a lot for it. I feel like it is related to whatever is happening during service otherwise why is it happening at these specific times? Please let me know what you guys would do if you were in my place.

Thanks for your time

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[Ducati1098]

I would just let them fix it. Is a weird coincident, but I'm not sure I would be worried about it as long as the problem is resolved again this time.
What exactly did they do during the 20km and 50km services?

Also you may want to get a better explanation of what they fixed the first time, because "replaced cylinder number 5" doesn't make any sense.

 

[BroncoChallenger]

Yes that's weird, but ALWAYS follow the interval that comes first - that's why the manual states XX miles or XX months, whichever comes first. So if you're hitting mileage before time use mileage, if you aren't, use time.

It's under warranty so I agree, let them fix it, but definitely get a better description. It sounds to me like they likely replaced the injector for cylinder #5, but the description given isn't very clear.

Now, this IS a 2022 we are dealing with, and IIRC there is a valvetrain recall (at least in the US, I see you're overseas) that could be a contributing factor if it hasn't been done. Do you know if it has been?

 

[Ducati1098]

Now, this IS a 2022 we are dealing with, and IIRC there is a valvetrain recall (at least in the US, I see you're overseas) that could be a contributing factor if it hasn't been done. Do you know if it has been?

I don't think any 22's were actually affected or have that recall.
I know the recall states 21-22, but I'm pretty sure that's just a mistake.
If the build dates on the recall are correct, it says May 1st 2021-October 30th 2021. No 22MY broncos were built until December of 2021.

 

[Bu3amraa]

Just wanted to clarify a couple of things after reviewing my service records.

The last time this issue happened (the engine shaking on startup and blinking check engine light) was actually in August 2024, not February like I initially mentioned. So it’s been less than a year since it last occurred.

Also, I asked the dealer again about what was done back then, and they confirmed that the repair involved replacing the coil assembly for cylinder number 5 under warranty.

Now that it’s happened again, with the same symptoms and timing right after a scheduled service, I’m even more convinced there’s a pattern here. Still waiting to hear from the dealership on what the diagnosis is this time, but I’ll update once I know more.

 

[Sgt Badlands]

If you are keeping it long term you may want to think about purchasing a extended warranty.

 

[Ducati1098]

Now that it’s happened again, with the same symptoms and timing right after a scheduled service, I’m even more convinced there’s a pattern here.

Maybe, if it's the exact same cylinder.
But the fact that it was fine for a while after the first repair likely means it's a different issue.

 

[BroncoChallenger]

I don't think any 22's were actually affected or have that recall.
I know the recall states 21-22, but I'm pretty sure that's just a mistake.
If the build dates on the recall are correct, it says May 1st 2021-October 30th 2021. No 22MY broncos were built until December of 2021.

Ah. Well that I was not aware of, since I don't own a '22. Good to know.

 

[Bu3amraa]

Hey guys, so I just picked up my car and the following is what they did as shown in the report.

Then I also asked them what they did the last time the same issue happened they showed me the following report

Do you guys think I should just let this go? I still have around 2.5 years on my warranty.

 

[Ducati1098]

Hey guys, so I just picked up my car and the following is what they did as shown in the report.

Then I also asked them what they did the last time the same issue happened they showed me the following report

Do you guys think I should just let this go? I still have around 2.5 years on my warranty.

What do you mean let it go?
Does it drive normally now? If so, it was obviously just a separate concern. Parts fail sometimes, nothing I would worry about.

 

[SierraBronco]

Hey guys, so I just picked up my car and the following is what they did as shown in the report.

Then I also asked them what they did the last time the same issue happened they showed me the following report

Do you guys think I should just let this go? I still have around 2.5 years on my warranty.

Oof-that’s rough. Hopefully they’re better at calibrating than they are at spelling. Is calliberating another word for Crank Relearn? That seems to have helped ours.

 

[Bu3amraa]

What do you mean let it go?
Does it drive normally now? If so, it was obviously just a separate concern. Parts fail sometimes, nothing I would worry about.

I can escalate things and refuse their solution and possibly file a legal complaint to Consumer Protection authorities. I just worry that since it was a misfiring issue twice in under a year that there might be some bigger problem here and they are just treating the symptoms.

 

[Ducati1098]

I can escalate things and refuse their solution and possibly file a legal complaint to Consumer Protection authorities. I just worry that since it was a misfiring issue twice in under a year that there might be some bigger problem here and they are just treating the symptoms.

I mean it’s your vehicle, but I really don’t understand why you feel like you would even need to do that

Yes, they were both misfire issues. But as long as it isn’t misfiring anymore, it sounds like they diagnosed and fixed it correctly both times on 2 completely separate cylinders and 2 different parts. There’s nothing to suggest you will continue having any problems.

If it happens again recently on the same cylinder, then I could see a cause for concern maybe

 

[Brian_B]

I can escalate things and refuse their solution and possibly file a legal complaint to Consumer Protection authorities. I just worry that since it was a misfiring issue twice in under a year that there might be some bigger problem here and they are just treating the symptoms.

That would be difficult to do if your truck is running fine now. Two issues, it was solved both times; and it was two different parts on two different cylinders that failed.

 

[Bu3amraa]

Thanks guys, I guess you are right. Thanks for the support.

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